The NYPD is looking for a man who punches his victims about the head before robbing them.

Four people have been attacked in the Baychester section of the Bronx between May 27 and July 12.

In the last incident, the suspect is seen on a surveillance video walking up behind the victim in a building lobby. He then starts punching her in the head.

It shows the woman falling and then struggling with the suspect who overpowers and robs her.

Anyone with information about the attacks is asked to call Crime Stoppers hot line at 1-800-TIPS. All calls will be kept confidential.