The Explosions on St. Petersburg's Metro

A suspect arrested in connection with the attack that killed 14 people says he didn't realize what he was doing.

Here’s what we know about the April 4 attack:

—A suspect arrested in connection with the attack that killed 14 people says he didn’t realize what he was doing.

—Nine people have been arrested in connection with the attack.

—Russian authorities say Akbarzhon Jalilov, a 22-year-old Kyrgyz-born Russian, detonated a bomb between two metro stations.

—This is a developing story and we’ll be following it here. All updates are in Eastern Standard Time (GMT -4).