On 13 May 2005 SNB troops, along with military and Interior Ministry forces, killed a large number of protesters in Andijan, in an event that became known as the Andijan massacre. Estimates of those killed range widely, from the official figure of 187 to upwards of 1,000. The protests related to the arrest of a group of local businessmen, and the massacre was preceded by disorder including, according to Pravda, an attempt to seize the regional headquarters of the SNB.