Russia's top investigative body says terrorism is suspected in a pair of rush-hour suicide bombings on Moscow's subway system that killed at least 36 people.
Both explosions are blamed on female suicide bombers and the blasts wounded more than 30 people.
An Emergency Ministry spokeswoman says 23 people were killed at the Lubyanka station in central Moscow, underneath the main offices of the Federal Security Service. It's the KGB's main successor agency.
A second explosion hit the Park Kultury station about 45 minutes later, killing at least 12 people.
Responsibility for that blast was claimed by Chechen rebels and Suspicion in Monday's explosions is likely to focus on Chechen rebels and other separatist groups.
The Moscow subway system is one of the world's busiest, carrying around 7 million passengers a day.