Police were investigating a pair of strong-arm robberies that occurred minutes apart late Friday.
At about 11:20 p.m., a 63rd Street man was jumped from behind as he walked up his driveway. The victim told police he was punched in the mouth, knocked down and robbed of $100 cash.
The man, the victim of two previous robberies, told police he suspected local teens.
Police tracking dogs followed a trail to the Buffalo Avenue area before losing the scent, reports said.
At 11:55 p.m., a 19th Street man was jumped as he left a convenience store at 19th Street and Ferry Avenue.
Before entering the store, the victim had been involved in an altercation with three men in a pickup truck, who were waiting nearby when he came out, police said.
The victim was punched and kicked repeatedly before being robbed of $500 in cash.
The assailants then fled down an alley. Police said the victim was treated in Niagara Falls Memorial Medical Center.