National Secretary Siddharth Nath Singh today challenged TMC MP Derek O’Brien to hold a protest march in the city over the alleged gangrape of a nun, the way he did in New Delhi after a church was destroyed there.

"The alleged gangrape is a condemnable incident, but I will like to question O’ Brien if he will carry out a protest march in Kolkata as he did in Delhi," he told PTI.

"If he carries out the march, I promise that I will join it," he said.

O’Brien, when contacted, said he did not need to react to what Singh had stated, but said, "State Chief Minister Mamata Banerjee is in constant touch with the Archbishop of Kolkata since yesterday. This is a highly condemnable incident."

"I myself am in touch every few hours with the Archbishop of Kolkata, senior church officials in Delhi and also nuns of the Convent of Jesus and Mary. The state government has acted swiftly. The higest levels of administration will do all what is nedded to find and book the culprits. The CID and the police are doing their job," O’Brien added.