Islamabad, Pakistan (CNN) -- A truck laden with explosives rammed into the wall of a paramilitary complex in Pakistan on Thursday and detonated, a military spokesman said.
The blast in Karachi injured 21 -- three critically -- and damaged the wall of a Rangers housing complex, said Maj. Bilal Farooq. No deaths were reported.
Farooq condemned the attack as a "cowardly act."
The truck had more than 220 pounds (100 kilograms) of explosive material, said Karachi police spokesman Javed Odho.
The Rangers are a paramilitary force in the Pakistani army often assigned to security detail in conflict regions.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or email@example.com.