Russian investigators are still focusing on a probable suicide bomber attack on Monday in Moscow’s busiest airport, which killed at least 35 people and injured more than 100, 48 of whom are in a critical condition.
The blast ripped through the international arrivals section of Domodedovo airport, killing many taxi drivers who were lined up awaiting fares.
Smoke filled the terminal building and a fire broke out all along one side. No-one has yet claimed responsibility for the attack, but North Caucasus rebels have threatened to strike at Russian cities this year ahead of parliamentary elections.
Some analysts have suggested the international nature of the target suggests they are trying to heighten uncertainty beyond Russia’s borders. They have identified the upcoming Winter Olympics in Sochi in three years time as a target, with the football World Cup being held in Russia four years later.