Police are looking for a man they say tried to sexually assault a woman in Brooklyn. 

Investigators say the man seen above followed a 36-year-old woman to her apartment building in Williamsburg just before midnight Wednesday.

The woman let him inside after he said he was there to visit someone else.

When they got to the third floor, police say he attacked the victim.

The woman started screaming and her son came outside, scaring the man away.

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.