Police are asking for the public's help in finding an armed robber in the Bronx.
Investigators say a masked man walked into the Black Era clothing store on Melrose Avenue around 10 a.m. last Friday, pulled out a gun, and demanded the owner fill a knapsack with money.
The owner put $100 in the bag and the robber then demanded a pair of sneakers.
When an alarm went off the owner grabbed the gun from the robber, who took off his mask and fled the store.
Surveillance video shows the robber running down the street with the bag while a good samaritan chases him.
Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.