It happened around 8:20 p.m. along the 4800 block of North 2nd Street.
Police say a man toting nine handguns in a duffel bag was confronted by another man armed with a gun.
The gunman, described as being heavyset and wearing short khaki pants, was accompanied by a second man, armed with a knife and wearing black clothing.
Both suspects were wearing ski masks and fled on foot with the duffel bag.