Mourners have gone to the attack site to pray and leave flowers

Dozens of people are still being treated in hospital for injuries suffered in the explosions, which killed 15 people as well as the two female bombers.

Moscow officials have blamed the attacks - the first suicide bombings in the Russian capital - on Chechen rebels.

Television stations have been asked to alter their schedules, keeping entertainment programming to a minimum, as a mark of respect for the dead.

Theatres and cinemas in the city have cancelled comedies, and the flags over the Kremlin are flying at half-mast.

Distraught young people have hugged each other for comfort

Black ribbons have been tied to flagpoles on official buildings all around the city.

At the site of Saturday's bomb attack, the Tushino air base, people have been bringing flowers.

A pile of roses and carnations lines a nearby wall.

The first funerals of the victims are also taking place on Tuesday in the city.

President Vladimir Putin has vowed to root out Chechen militants and show them no mercy.

But critics point out that he has said that before, with no sign so far that his tactics have borne much fruit.

The BBC's Sarah Rainsford in Moscow says Saturday's suicide attacks suggest a growing determination among rebel groups to carry their fight to the heart of Russia.