Terror group Al-Qaeda, in a threat letter dated June 6, said it would launch suicide attacks in Delhi, Mumbai, Uttar Pradesh and Gujarat to "fight for the honour of the Prophet, reports indiatoday.in.

The bomb attacks threat comes in the wake of the derogatory remarks made by former BJP spokesperson Nupur Sharma who has been suspended.

Suspended BJP functionary Nupur Sharma was on Tuesday summoned by Maharashtra Police in the case against her for controversial remarks on Prophet Mohammad that have drawn mounting backlash in India and abroad, while security was provided to her by the Delhi Police after she complained of receiving death threats.

The Opposition has been demanding strict legal action against Sharma and has accused the ruling BJP of harming India's image with its "politics of hatred'' after many Muslim countries lodged protest and issued statements criticising the alleged derogatory remarks made during a TV debate.

Asserting that the controversy had not impacted the NDA dispensation as Sharma was not a government functionary, Union Minister Piyush Goyal said ''good relations" would continue with the countries, even as Malaysia, Iraq and Libya joined over a dozen Muslim nations in condemning the comments by Sharma.

Delhi-based Sharma has been summoned by the Mumbra police in Thane, neighbouring Mumbai, to record her statement before the investigating officer on June 22 in connection with an FIR registered against her, a Thane police official said.