Boston Police report arresting a Dorchester man they say approached the driver of another car with whom he had just crashed and displayed a handgun in a threatening manner, around 5 p.m. on Tuesday.

Police say officers responding to a report of a man with a gun on Dorchester Avenue near the intersection with West 5th and A streets found Danh Nguyen, 29, standing near one of two cars that had obviously just collided.

Due to the nature of the call, officers immediately conducted a pat-frisked and recovered an unloaded 9mm Sig Sauer P320 Pistol inside of a fanny pack, along with two fully loaded ten round magazines. After further investigation it was revealed that after the motor vehicle accident and before police arrival, Mr. Nguyen was observed exiting his motor vehicle with the Sig Sauer Pistol in his hand as he approached the driver's side window of the victim’s motor vehicle.

Nguyen was charged with assault by means of a dangerous weapon, unlawful possession of a firearm and unlawful possession of ammunition, police say.