Police are now offering a $12,000 reward for information leading to an arrest in the alleged sexual assaults of two children in Queens.
They say the suspect in those cases may also be linked to a third incident.
Police have released new surveillance video of the man they want to speak to.
They believe the man attacked two 7-year-old girls just hours apart on Wednesday.
One of the victims was playing on Sutter Avenue in South Ozone Park.
Police say she was attacked when she went to retrieve a ball after it went over a fence.
Hours before, and in the same neighborhood, police say the same man groped another girl, but ran off when the girl's older sister screamed.
Police Commissioner Ray Kelly said the description of the man matches a third incident that happened Thursday, when a 13-year-old girl told police she saw a man exposing himself in a van.
He's believed to be in his 20s and around 6 feet tall.
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.