Memorial services have been held in Moscow to honour those killed in the suicide bombings at a rock concert on Saturday. The attacks killed at least 17 people, including two women suicide bombers, and wounded more than 48. Several of the injured are still fighting for their lives. Forensic teams are combing through the debris but the Russian authorities have already blamed hard core Chechen rebel groups. President Vladimir Putin, who on Friday set 5 October as the date for a presidential election in Chechnya, has vowed that he will not be thrown off course by such acts of violence. However, he has postponed two overseas visits in the wake of the attacks, according to a statement from the Kremlin. Putin had been due to travel to Uzbekistan on Sunday and Malaysia on Tuesday.