Police co-ordinate the scene after the explosions that rocked the Boston Marathon road race on Monday.

Moscow - Russian President Vladimir Putin has offered his country's assistance in investigating the Boston bombings that killed three people and injured more than 140 others.

Putin said in a condolences note published on the Kremlin's website on Tuesday that the international community should come together to fight terrorism.

Putin said Russia “would be ready to provide assistance” to US authorities with the probe into the bombings at the Boston Marathon.

Obama's national security adviser Tom Donilon met with Putin on Monday and presented a letter from Obama in an effort to improve relations, which have nosedived in recent months.

Despite Obama's efforts to “reset” relations with Russia during his first term, ties worsened over conflicting approaches to the Syrian crisis and US concerns about the Kremlin's crackdown on dissent. - Sapa-AP