A man is accused of 13 robberies across the city, including nine in Brooklyn, police say.
Police say the suspect targets women and senior citizens.
During some of the incidents, police say he threatened his victims with a knife.
On numerous occasions, he actually punched victims before taking off with their belongings.
Police have released surveillance images of the suspect and say he's about 5'7'' tall.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.