Moscow (CNN) -- The leader of Islamist rebels suspected of bombing Moscow's main international airport last month is pledging to step up deadly attacks in Russia.
In a video message posted Sunday on a pro-rebel website, Doku Umarov stopped short of claiming responsibility for the January 24 airport bombing, which left 36 people dead.
But the self-titled Emir of the North Caucasus vowed to deliver "a year of blood and tears" to Russia, saying that there were dozens of rebels prepared to carry out attacks.
"I won't tell you there are hundreds of us prepared for Jihad. But 50 or 60, God willing, we will find," Umarov said in Russian, wearing camouflage combat fatigues.
"Those operations will be conducted monthly or weekly, as Allah allows us," he said.
In Moscow, investigators say they have identified the suspected suicide bomber as a 20-year-old man from the North Caucusus region. CNN
