Fresh warnings have been sounded of terrorists carrying out suicide attacks on ministries in the federal capital and the airport in the southern port city of Karachi and the security set up has been beefed up.

The warnings by the intelligence agencies have been circulated by the interior ministry, which said they could be carried out as reprisals as Taliban [Images], al Qaeda and other foreign militant elements, who have suffered badly in ongoing operations by the security forces in the tribal areas.

According to official figures, more than 1,500 Taliban cadres have been killed in the army operations carried out in the Bajaur agency and Swat valley.

The interior ministry, has warned that November would be a crucial month as terrorists have planned suicide attacks on Karachi's Jinnah International Airport and various ministries in Islamabad [Images].

The terrorists have dispatched suicide bombers to Karachi, Lahore [Images] and Islamabad, the sources said.

No details about the modus operandi of the terrorists were disclosed in the information conveyed to the ministry by the intelligence agencies, the Daily Times reported on Tuesday.

The source added that the information gathering agencies have sent complete details of two would-be suicide bombers recently dispatched by the Tehrik-e-Taliban Pakistan to law enforcement agencies.

Pakistan has witnessed a deadly wave of suicide bombings since the military carried out an operation against militants holed up in the Lal Masjid in Islamabad in July last year.

Hundreds of people, including former premier Benazir Bhutto [Images] and a serving general of the Pakistan Army [Images], have died in the attacks. Suicide bombers have struck with high security areas like the garrison city of Rawalpindi and several cantonments.