The Provisional Irish Republican Army (IRA) was an Irish nationalist movement founded in December 1969 when several militants, including Seán Mac Stíofáin, broke off from the Official IRA and formed a new organization. Led by Mac Stíofáin in the early 1970s and by a group around Gerry Adams since the late 1970s, the Provisional IRA sought to bring about an all-island Irish state. Between 1969 and 1997, during a period known as the Troubles, the group conducted an armed campaign, including bombings, gun attacks, assassinations and even a mortar attack on 10 Downing Street. On July 21, 1972, in an attack later dubbed Bloody Friday, the group set off twenty-two bombs, killing nine and injuring 130. On July 28, 2005, the Provisional IRA Army Council announced an end to its armed campaign. The IRA is believed to have been a major exporter of arms and to have provided military training to groups such as the FARC in Colombia and the PLO. In the case of the latter there has been a long-standing solidarity movement, as evidenced by many murals around Belfast.