[UPDATE BELOW] Two women were attacked by a hammer-wielding man in separate incidents in and around Union Square last night. Police say neither women knew the assailant. Update: The police released a photo of the alleged attacker (see below).

According to the NYPD, officers responded to a 911 call at around 7:36 p.m. and found that a 28-year-old woman sitting on a park bench in Union Square Park had been assaulted by an "unknown male [who] removed a hammer from inside of a bag and struck her in the head." NBC New York reports, "[S]he saw the suspect looking at her, police said. When she looked back, he took out a silver hammer and struck her." The suspect fled.

Then, 10 minutes later, police say that a 33-year-old woman walking west near 45 West 17th Street was "approached by an unknown suspect from behind and struck in the back of the head causing a scalp injury."

Both victims were taken to Lenox Hill Hospital for treatment and have been released.

The police released a sketch of the suspect, describing him as having a medium build and wearing a black waist length jacket, dark-colored baseball hat, dark jeans, black sneakers, and wearing a black backpack.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS. 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.

Update: The suspect may be connected to a third attack that occurred earlier yesterday. According to NBC New York, "In that case, a 20-year-old man was hit with a hammer near Sixth Avenue and 35th Street shortly before 2 p.m., the sources said. He refused medical attention."

The police have now released an image of the suspect. At this time, they say he is wanted for the two attack in and around Union Square: