A single terrorist group may be behind the explosions in Moscow and Dagestan, Russian Prime Minister Vladimir Putin said on Wednesday.
"I do not rule out that this is one and the same group," Putin said at a government session.
He ordered Interior Minister Rashid Nurgaliyev to strengthen police units in the North Caucasus.
As many as 12 people died on Wednesday in twin blasts in the town of Kizlyar in Russia's North Caucasus republic of Dagestan.
On Monday, two suicide bombings on the Moscow metro killed at least 39 people and injured dozens more.
NOVO-OGARYOVO, March 31 (RIA Novosti)
