UPPER EAST SIDE, Manhattan — Hours before an "emotionally disturbed" man shoved a bag of feces down a woman's shorts on the Upper East Side, he allegedly threw feces in another woman's face in the same neighborhood, officials said Thursday.

Investigators believe one man is behind the two attacks involving feces, Chief of Detectives Robert Boyce said.

A law enforcement source said the first attack happened about 2:25 p.m. Monday. A 33-year-old woman was walking east on East 91st Street when a man threw feces in her face then ran away, heading north on Park Avenue.

That same man is believed to have struck again later that day. It was about 6 p.m. when a 27-year-old woman was followed on East 74th Street by a man who pulled at her shorts, shoved a bag of feces down her shorts and grabbed her buttocks, police said.

The younger victim was on her cellphone and did not appear to notice the man running up behind her, the video shows.

Police said the victim did not know her attacker and they believe the encounter was random. No arrests have been made.

The culprit is believed to be about 40 years old, 6 feet tall, weighing 200 pounds, with a dark complexion and afro-style hair.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS or for Spanish 1-888-57-PISTA (74782)

The public can also submit their tips by logging onto the Crime Stoppers Website at WWW.NYPDCRIMESTOPPERS.COM or texting their tips to 274637(CRIMES) then enter TIP577.\