A police officer’s arm was allegedly slashed with a blade in the heart of Jodhpur Park on Thursday night when he tried to pacify two warring groups of Trinamul Congress and BJP supporters.

Trouble began when the Trinamul workers allegedly protested a pro-CAA BJP rally near Jodhpur Bazaar around 9pm, police sources said.

“There was a clash in the bazaar area. One motorcycle was torched,” said a resident of Jodhpur Park.

The bike’s fuel tank burst into flames and the fire spread to a tree next to which the two-wheeler was parked.

The officer of the rank of sub-inspector, posted as anti-rowdy officer at Lake police station, was allegedly attacked when he intervened.

“He was attacked with a sharp weapon, possibly a blade,” said another officer. “We are trying to identify the accused.”

There was no confirmation on the number of people arrested from the spot till late on Thursday.

A Jodhpur Park resident said she had never seen anything like this happen in the neighbourhood in her lifetime.

“This was no interior bylane but the main thoroughfare of Jodhpur Park. I cannot believe we had to close our windows in fear,” the resident said.