International, in Domodedovsky District, Moscow Oblast, on 24 January 2011. The bombing killed 37 people and injured 173 others, including 86 who had to be hospitalised. Of the casualties, 31 died at the scene, three later in hospitals, one en route to a hospital, one on 2 February after having been put in a coma, and another on 24 February after being hospitalised in grave condition. Russia's Federal Investigative Committee later identified the suicide bomber as a 20-year-old from the North Caucasus, and said that the attack was aimed "first and foremost" at foreign citizens. 2013 In December 2013, two separate suicide bombings a day apart targeted mass transportation in the city of Volgograd, in the Volgograd Oblast of Southern Russia, killing 34 people overall, including both perpetrators who were aligned to Caucasus Emirate and Vilayat Dagestan. The attacks followed a bus bombing carried out in the same city two months earlier. On 21 October 2013, a suicide bombing took place on a bus in the city of Volgograd, in the Volgograd Oblast of Southern Russia. The attack was carried out by a female perpetrator named Naida Sirazhudinovna Asiyalova (Russian: Наида Сиражудиновна Асиялова) who was converted to Islam by her husband, she detonated an explosive belt containing 500–600 grams of TNT inside a bus carrying approximately 50 people, killing seven civilians and injuring at least 36 others. 2014 On 5 October 2014 a 19-year-old man named Opti Mudarov went to the town hall where an event was taking place to mark Grozny City Day celebrations in Grozny coinciding with the birthday of Chechen President Ramzan Kadyrov. Police officers noticed him acting strangely and stopped him. The officers began to search him and the bomb which Mudarov had been carrying exploded. Five officers, along with the suicide bomber, were killed, while 12 others were wounded. On 4 December 2014, a group of Islamist militants, in three vehicles, killed three traffic policemen, after the latter had attempted to stop them at a checkpoint in the outskirts of Grozny. The militants then occupied a press building and an abandoned school, located in the center of the city. Launching a counter-terrorism operation, security forces, with the use of armored vehicles, attempted to storm the buildings and a firefight ensued. 14 policemen, 11 militants and 1 civilian were killed. Additionally 36 policemen were wounded in the incident. The Press House was also burned and severely