The new Home Secretary Madhukar Gupta, after taking charge on Saturday, held a meeting of various security agencies where he was given a detailed briefing by officials of the ministry on steps taken to prevent any untoward incident during the summit, official sources said.

The national capital, which will host the summit on April 3 and 4, will be dotted by crack commandos of Delhi Police and the paramilitary forces.

During the meeting, all paramilitary forces were asked to keep a company each in readiness to meet any situation, the sources said.

Heads of seven nations -- Afghan President Hamid Karzai, Sri Lanakan President Mahinda Rajapakse, Pakistan Prime Minister Shaukat Aziz, Nepalese Prime Minister G P Koirala, Maldives President Maumoon Abdul Gayoom, Chief Advisor of Bangladesh's interim government Fakhruddin Ahmed and Bhutan Prime Minister Khandu Wangchuk -- will attend the summit.

Karzai and Rajapakse are among the leaders facing "serious threats" and additional sharp-shooters and commandos will be deployed along with an additional ring of security personnel to protect them, the sources said.

Special arrangements are being made at the Indira Gandhi International Airport as the leaders from Nepal, Bhutan and Bangladesh will arrive by routine flights.

The heads of the seven nations will stay in four different hotels in the city and their entry and exit points will be manned by security personnel.

The home secretary asked officials to ensure that there is minimum inconvienence to the public during the movement of VVIPs in the city.

Roads used for their movement from the hotels to other venues will be temporarily closed to other vehicles, the sources said.

The entry and exit points of the national capital are being monitored closely to ward off threats from anti-national elements, they said.

Security officials are in close contact with their counterparts in neighbouring states to ensure that no terrorists sneak into the capital.