By Brad Segall

UPPER MORELAND, Pa. (CBS) – A wheelchair bound Upper Moreland man is under arrest in Montgomery County accused of firing a gun into a crowd at an apartment complex late Thursday night injuring two people, including his mother.

Police say witnesses told them Lorenzo Sims was holding the gun in his right hand while pushing his wheelchair with his left hand.

Police believe he fired twice into a crowd of seven people at the Willow Hill Apartments on Easton Road shortly after 10:30 p.m.

A 32-year-old man, who was believed to be the intended target, was hit in the arm and stomach.

A 44-year-old woman, Sims’ mother, was shot in the hand.

Prosecutor Kevin Steele believes an argument may have led to the shooting.

“At this point we are still investigating in terms of the defendant’s actual involvement in that argument, however he’s the one that finished the argument.”

The 22-year-old Sims is charged with attempted murder, assault and related charges.

Authorities say he’s also a convicted felon who shouldn’t have a weapon.

Police say the gun believed to be used in the shooting has been recovered.