Many insurgent attacks have occurred in Yemen since its crisis began in January 2011, and even more so since its civil war began in September 2014.[1][2] The Houthi movement, who began its insurgency in 2004, seized the country's capital city Sanaa in September 2014 and has occupied it ever since.[2] In March 2015, 142 people were killed by Islamic State suicide bombers at two Shia mosques in Sanaa.[1]