The NYPD has released a video of the suspects they believe were involved in a possible hate crime against a Columbia professor on Saturday night.

According to an NYPD spokeswoman, the clip shows the group of 12 to 15 suspects on bikes, ages 15 to 20, shortly before they encountered Dr. Prabhjot Singh, a Sikh, on West 110th Street near Lenox Avenue. Dr. Singh said that someone in the group shouted "Get Osama!" and then "Terrorists!" as they beat him and tugged at his beard.

Dr. Singh is an assistant professor at Columbia's School of International and Public Affairs, and earned his M.D. at Cornell and his PhD in Neural and Genetic Systems at Rockefeller University. He suffered a fractured jaw in Saturday's attack, which is being investigated by the NYPD's Hate Crime Task Force.

If you have any information on the assault, contact CrimeStoppers at 1-800-577-TIPS or visit their website.