The Moscow underground network was brought to a standstill this morning after a series of bomb blasts, killing at least 35 people and injuring more than 50.
Two explosions were triggered by female suicide bombers during the morning rush hour on the Russian capital's underground, reports said. Rebels from the Caucasus region were believed to have carried out the attacks.
The first bomb exploded at Lubyanka station just before 8am local time, followed by a second explosion about 40 minutes later at Park Kultury station.
The UK Foreign and Commonwealth Office has not issued a travel warning for Moscow, but warns against travel to Chechnya, Ingushetia and Dagestan because of the security situation in the North Caucasus.
The FCO said on its website: "We are in contact with the Russian Ministry of Emergencies, and we will continue to monitor the situation and update our travel advice and website accordingly."
The Moscow metro is one of the busiest underground rail systems in the world, carrying more than 7 million passengers on an average weekday.
www.fco.gov.uk