Battalion of Imam Shamil claimed attack in St. Petersburg subway bombing

A website that has previously carried Al Qaeda messages on Tuesday issued a claim of responsibility for the recent subway bombing in St. Petersburg, Russia, publishing a statement from a previously unknown cell said to be working on behalf of the terrorist group.

Russian investigators identified Akbarzhon A. Dzhalilov as the suicide bomber who carried out the April 3 attack, which killed 15 people and wounded at least 60. Security officials at the time said they were unsure whether Mr. Dzhalilov had acted alone, and they detained several other people in connection with their investigation.

The previously unknown group claiming responsibility, the Imam Shamil Battalion, said in its statement that Mr. Dzhalilov had acted on the orders of Ayman al-Zawahri, the leader of Al Qaeda, according to a translation provided by the SITE Intelligence Group, which tracks extremist propaganda. The statement also threatened additional attacks, as reported by New York Times.