Someone loosened the lug nuts on a Boston cop’s personal vehicle in East Boston — the third incident of tampering on cops’ cars this month, police said.

The officer spotted two lug nuts missing from one of the wheels on her car in the East Boston police station’s parking area on Wednesday, police said.

Two other officers had the tires of their personal vehicles fall off or become dislodged under suspicious circumstances while they were driving, police said.

On July 15, a Boston cop was driving his personal vehicle away from the downtown police station when the rear left wheel “came dislodged” police said. At the time a tow truck driver and a mechanic who examined it both said it appeared the nuts were intentionally loosened.

On Aug. 4, the rear tire of a transit police officer’s personal vehicle fell off while the officer was driving home, police said. The vehicle had been parked at the Boston Police Department’s Youth Violence Strike Force parking lot prior to that, but cops were unable to determine where the lug nuts were loosened, police said.