File photo: Xinhua

NEW DELHI, Feb. 24 (Xinhua) -- A policeman was killed Monday during violent clashes over controversial citizenship law in the Indian capital city Delhi, police said.

The head constable was killed in the clashes that broke out between pro- and anti-Citizenship Amendment Act (CAA) groups in the northeastern part of the city.

"The violence escalated today and massive stone-pelting broke out between the two groups. Policemen trying to contain the situation," a police official not authorized to talk to media said. "Unfortunately a policeman of the rank of head constable was killed in the violence."

According to the police official, they were trying to ascertain the details that led to the killing of the policeman.

Reports said the protesters have resorted to arson in Jaffrabad and Maujpur areas.

Clashes in the area started on Sunday and several policemen were injured.