MOSCOW, April 22 (RAPSI) - Russia and the United States are committed to boosting their efforts to jointly fight terrorism, Russian Foreign Minister Sergei Lavrov said on Monday.

During a recent telephone conversation, Russian President Vladimir Putin and US President Barack Obama confirmed their commitment to strengthen security coordination, Lavrov told a news conference in response to a question about the Boston Marathon bombings.

Lavrov declined to comment on reports that a Boston Marathon bombing suspect, Tamerlan Tsarnayev, had visited Russia.

“Sources in the US and Russian special services have already made the relevant comments on the issue and I have nothing to add,” Lavrov said.

Three people were killed last Monday and more than 180 injured after two powerful explosions ripped through a crowd near the finish line of the Boston Marathon. The other main suspect in the twin bomb attack, Tsarnaev’s older brother Tamerlan Tsarnaev, 26, died of wounds sustained in a shoot-out with police last Friday.

A Boston Marathon bombing suspect, 19-year-old Dzhokhar Tsarnaev, is awake and has answered investigators’ questions in writing from his hospital bed, ABC News said on Monday, citing unnamed “law enforcement sources.” He is still unable to talk after suffering throat and neck wounds, ABC said.