(CNN) -- In what could be one of the highest-level defections yet from the Syrian government, the country's military police chief has reportedly left Bashar al-Assad's forces to join "the people's revolution."
In a video posted online this week, a man identified as Maj. Gen. Abdul Aziz Jassim al-Shallal announced that he was joining the popular uprising.
"The Syrian military has strayed from its core mission in protecting the homeland to become nothing but armed gangs that kill and destroy the cities and the villages, carrying out massacres against our innocent civilian population that came out demanding freedom and dignity," he said.
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Al-Shallal had been planning his escape to Turkey for weeks with the help of rebels, said Louai Miqdad, a spokesman for the rebel Free Syrian Army, speaking from Turkey.
A man walks near a missile on Tuesday, December 25, at an army barracks outside Damascus, Syria, that has been taken over by the Free Syrian Army. Click through to view images from Syria from December, or see photos of the conflict from November.
Free Syrian Army fighters prepare a homemade missile before they launch it toward the military airport in Aleppo, Syria, on Sunday, December 23. Free Syrian Army members display shrapnel from what they say are the remains of a rocket fired from the Syrian army in northern Aleppo on Thursday, December 20. An unexploded bomb is seen lodged in a street in Ghouta, east of Damascus, Syria, Wednesday, December 19.
A Free Syrian Army fighter aims his weapon through a hole in the wall of the structure where he is positioned in the Qastal Harami area of Aleppo on December 19.
A child sits in the back of a vehicle at the border crossing leading to Masnaa, Lebanon, as people wait to stamp their documents before leaving Syria on December 19. Click through to view images from Syria from December, or see photos of the conflict from November.
Palestinian children who fled the Syrian refugee camp of Yarmuk wait at the Masnaa Border Crossing leading into Lebanon on December 19.
Syrians line up outside a bakery offering cheap bread in Aleppo, Syria on Sunday, December 16. A Syrian boy walks past a rebel fighter in the northern town of Darkush, Syria, on Friday, December 14.
Two men on a motorcycle lead a horse through the northern town of Darkush, Syria, on December 14, 2012.
Rebel fighters push out a boat carrying two Syrian women fleeing to Turkey through the Orontes River near the northern Syrian town of Darkush on December 14.
Passengers gather at a terminal at the airport in Aleppo, Syria, on Wednesday, December 12.
A member of the Syrian opposition's Al-Buraq Brigade stands guard on a main road in the northern Syrian town of Ain Dakna near the Turkish border on Monday, December 10. Click through to view images of the fighting from December, or see photos of the conflict from November.
A Free Syrian Army fighter takes position as he aims his weapon in Aleppo's al-Amereya district on Tuesday, December 11.
Men warm themselves by a fire on a street corner in Aleppo, Syria, on Sunday, December 9.
A rebel soldier watches Al-Jazeera news in a shop near the front lines in Aleppo on December 9.
A rebel soldier prays in a shop in Aleppo on December 9.
Syrians mourn a fallen fighter at a rebel base in the al-Fardos area of Aleppo on Saturday, December 8.
A Syria rebel commander sits behind a desk in his bombed-out position in Aleppo on December 8.
A Syrian rebel fighter emerges from a hole in a wall in Aleppo on December 8.
Rebel fighters take part in a demonstration against the Syrian regime after Friday prayers in Aleppo on December 7.
A wounded rebel fighter is transported to a hospital in the back of a truck in Aleppo, Syria, on Thursday, December 6. At least 23 people died in Syria on Thursday, most of them in Damascus and Aleppo, according to the opposition Local Coordination Committees of Syria. Rebel soldiers stand guard inside a building in Aleppo on December 6. Angelina Jolie, special envoy for the U.N. refugee agency, meets with Syrian refugees at the Zaatari refugee camp outside Mafraq, Jordan, on December 6. In this handout from the Shaam News Network, Free Syrian Army fighters stand guard against forces loyal to Syrian President Bashar al-Assad in the Al-khalidiya neighborhood of Homs on Tuesday, December 4. In this handout from the Shaam News Network, Free Syrian Army fighters take cover in destroyed buildings during clashes with regime forces on December 4.
Syrians cross the border from Ras al-Ain, Syria, to the Turkish border town of Ceylanpinar on Tuesday, December 4. Boys walk through a damaged area In Aleppo, Syria, seen through a destroyed car on December 4.
A man inspects rubble in a neighborhood of Aleppo on Sunday, December 2.
The bodies of three children reportedly killed in a mortar shell attack are laid out for relatives to identify at a makeshift hospital in Aleppo on December 2. Smoke rises from fighting in the Hanano and Bustan al-Basha districts of Aleppo on Saturday, December 1. Syrian-Kurdish women and members of the Popular Protection Units, an armed opposition group to the Syrian government, stand guard during a comrade's funeral in a northern Syrian border village on December 1.
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Military police chief reportedly defects
Opposition: Syrians killed in attack
Intense violence kills dozens in Syria "The last three hours of al-Shallal fleeing the borders were on a scooter," Miqdad said. "This is how hard things can get when it comes to the coordination of the defections of some of the Syrian officers and how the FSA works hard to guarantee their safety and the passageway of their families."
CNN cannot independently verify many claims from Syria, as the government has severely restricted access by international journalists.
If true, it would be only the latest in a rash of high-profile defections from al-Assad's government.
Read more: U.N. envoy meets with Syrian president as deaths mount
Manaf Tlass, a brigadier general and a former friend of al-Assad, left Syria's Republican Guard in July. Prime Minister Riyad Hijab has also defected as have a number of soldiers.
The defections, combined with recent gains by rebels on battlegrounds nationwide, suggest that al-Assad is losing his grip on a country that his family has commanded for more than 40 years. But the president has given no indication that he will step down.
Read more: Opposition: More than 100 Syrians killed in bakery attack
Miqdad, the rebel spokesman, said it's in the best interest of Syrian officials to follow al-Shallal's lead.
"We would like to warn everyone who is serving in the Assad military: This is it. The time is near, and the FSA and the Syrian revolution are shifting the balance of power. If they don't defect now and denounce the regime, they will be considered to be traitors and they will have to face trial for the crimes that their troops committed against our people," he said.
"We urge them to defect now and join the revolution, or it will be too late."
Among the 3,300 Syrian refugees who have entered Turkey in the past two days, one was a member of Parliament, Turkey's state-run news agency TRT reported.
The Turkish Prime Ministry Disaster and Emergency Management Directorate said that 147,107 Syrians were staying in Turkey after fleeing Syria. It said a total of 206,954 Syrians had fled, but 59,847 returned home.
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Fierce battle for key city and base intensifies
Months of intense fighting over the city of Maaret al-Numan and the Wadi al-Deif military base came to a head Wednesday, with rebels pushing for control of key government areas, dissidents said.
"If the rebels manage to take over the Wadi al-Deif base and Maaret al-Numan, it could be a severe blow to the regime in the north because it will give the rebels the upper hand in controlling the entire Aleppo-Damascus highway," said Rami Abdulrahman, director of the opposition Syrian Observatory for Human Rights.
He said such victories would be a major strategic gain because rebels would be able to cut off all the reinforcements to regime forces in Syria's largest city and commercial hub, Aleppo.
"Wadi al-Deif is considered to be the main fuel storage for the regime forces and the largest military base in Idlib province. If the rebels managed to cut off the road by taking over the base and the security checkpoints that surround it, the opposition fighters would cripple the regime forces' ability to mobilize their forces not only in Idlib, but in Aleppo as well," Abdulrahman said. "Hundreds of regime forces will be left in disarray to fight on their own without any reinforcement, fuel or food supplies."
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By late Wednesday morning, rebels had announced "the start of the liberation" of Maaret al-Numan, the opposition Local Coordination Committees of Syria said.
But the Syrian Observatory said clashes continued in the city, punctuated by heavy shelling by regime forces. Dissidents also said rebels destroyed five armored vehicles and a tank.
Violence rages across Syria
Regime forces shelled targets in Raqqa province, a region in north-central Syria more sparsely populated than volatile enclaves to the east, an opposition group said.
The LCC said that, of 164 people killed in Syria on Wednesday, 42 died in Raqqa, many of them in Qahtaniya.
The state-run Syrian Arab News Agency blamed violence against civilians in Qahtaniya, including women and children, on an "armed terrorist group." Since the Syrian conflict began last year, the government has blamed people it labels as terrorists for the violence in the country.
In Hama province, citizen journalist Hassan al-Aarg said government shelling in the village of Kafr Zeta killed two toddler boys.
Their mother had laid them down on a blanket when a rocket strike by a government warplane targeted their home, said al-Aarg, who filmed the aftermath.
"I must find them!" their father wailed as he picked through the rubble to collect bits of flesh to place inside a clear plastic bag.
"Oh, God, do you not see?" their mother asked. "Do you not see?"
The twins died about six miles from where more than 100 people standing on line outside a bakery were killed when it was attacked Sunday by warplanes.
CNN cannot confirm the authenticity of the reports because of the restrictions on journalists. The deaths occurred several miles from the bread line pounded by warplanes Sunday.
More than 40,000 people -- mostly civilians -- have been killed in the Syrian crisis since March 2011, according to tallies by opposition activists.
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CNN's Holly Yan and Joe Sterling contributed to this report.