Ahead of U.S. President Barack Obama's visit, a full rehearsal of the security arrangements, involving the U.S. Secret Service, the Indian intelligence agencies and the National Security Guard (NSG) commandos, will be held in Mumbai on Thursday.

The security dress rehearsal will also have the participation of the Mumbai police, the Navy and the Air Force. The American Air Traffic Control personnel were likely to take part in it, sources in the Home Ministry said.

A similar exercise will be carried out here, most probably on Friday.

On his three-day visit, Mr. Obama will arrive in Mumbai on November 6 and in Delhi a day after.

Vigil by UAVs

All high-rise buildings in the vicinity of Mumbai's Taj Mahal Hotel and Delhi's Maurya Sheraton, where Mr. Obama will stay, would be sanitised, with security personnel guarding them from rooftop. Unmanned aerial vehicles (UAVs) would also be pressed in to service, the sources said.

In the Capital, the ridge area opposite the Maurya Sheraton hotel – has been illuminated by floodlights as part of the security drill.

The Mumbai coastline will be guarded by the Navy personnel while the skies of both the cities will be protected by the IAF fighter jets and helicopters.

The Home Ministry had issued an alert for Mumbai and Delhi, asking the authorities to take extra precautions during Mr. Obama's visit as well as on Diwali.

Parcel checking

In another development, the government directed all airports, sea ports and the Postal Department to thoroughly check any parcel coming from Yemen and Somalia in the wake of detection of parcel laden with explosives from Yemen that found its way in air cargo.