Moscow legislators held a minute of silence on Tuesday to remember the 35 people killed in the suicide attack at Domodedovo International Airport.
"I express my sincere condolences to the families of those killed and injured," Mayor Sergei Sobyanin said upon opening the session.
Up to 180 others were injured after a suspected female suicide bomber set off an explosive device hidden in a bag in the airport's busy international arrivals zone on Monday.
The blast was equivalent to 5 kilograms of TNT and the bomb was packed with metal objects to cause maximum damage.
A law enforcement source told RIA Novosti the bomber was accompanied by a man whose head was ripped off by the explosion.
The international community condemned the blast, with NATO Secretary-General Anders Fogh Rasmussen saying he was "deeply disturbed" by the attacks.
"I strongly condemn this outrageous act of terrorism against the Russian people," U.S. President Barrack Obama said in a statement.
British Premier David Cameroon offered the Russian authorities "complete support" and "made clear that the people of Britain stood with the people of Russia in the face of these events," a Downing Street spokesperson said. Two Britons were among the dead.
UN Secretary General Ban Ki-moon was appalled by the bombing and "condemns this deplorable and unjustifiable act of violence against innocents," his spokesman said.
The attack was the most serious on Moscow since two female suicide bombers from the volatile North Caucasus republic of Dagestan blew themselves up at two of the capital's subway stations last March, killing 40.
Police have hinted the latest outrage may be linked to the Islamist radicals in the North Caucasus.
Three suspects are being sought over the bombing.
Russian President Dmitry Medvedev said there "there were clear security breaches" at the airport, and that security officials will be held accountable.
MOSCOW, January 25 (RIA Novosti)