Bieber's Bad Week Keeps Getting Worse

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(CNN) -- U.S. Customs and Border Protection officers searched an airplane carrying Justin Bieber and others Friday afternoon at Teterboro Airport in New Jersey after officers said they detected an odor of what seemed like marijuana, law enforcement sources told CNN.

Bieber and the other occupants were questioned, said the sources, who spoke on condition of anonymity.

CBP officers used dogs to search the airplane, according to one of the law enforcement sources. But no sign of drugs were detected and no illegal substances were found, the source said.

The U.S. Customs and Border Protection had not commented on the matter.

-- From CNN's Evan Perez and Shimon Prokupecz