Authorities on Friday were continuing to probe a police-involved shooting in North Philadelphia in which an officer apparently struggled with an armed motorbike rider and then shot the man as he was running.

The encounter unfolded about 6:40 p.m. Thursday on Whitaker Avenue near Hunting Park Avenue, when a 15th Police District officer who was transporting two witnesses to the nearby headquarters of the Special Victims Unit spotted someone operating a motorbike recklessly, said Police Commissioner Richard Ross.

The motorbike stalled and the officer pulled up next to it and attempted to speak with its operator, who began backing away. The officer exited his patrol car to conduct a frisk and felt a handgun in the male's waistband. The officer ordered the man, who began holding the front of his waistband, several times not to reach for the gun but he did so anyway, officials said.