NEW YORK: Two Muslim teenagers were beaten outside a New York City mosque by an attacker who shouted slurs at them, a rights group said on Monday, calling for police to investigate the incident as a bias crime.

The attack early on Sunday was at least the third involving Muslims in the United States over the weekend. A law enforcement source said investigators had ruled out the incident as a bias crime.

The New York chapter of the Council on American-Islamic Relations, or CAIR, said in a statement that a 16-year-old boy was attacked outside Brooklyn's Muslim Community Center as he took a break from prayers.

A surveillance video released by CAIR showed a man punching, kicking and stomping the youth as he lay in the street. Another teenager on a bicycle was chased and attacked when he rode past the boy. CAIR said the man was reportedly heard shouting: "You Muslims are the cause of all the problems of the world" and calling the youths "terrorists." The 16-year-old suffered a concussion, cuts, bruises and a badly swollen eye, and was taken to a hospital. The second teenager had a black eye, CAIR said.