LONDON (AFP) - A long-awaited public inquiry into allegations that 20 or more Iraqi civilians were murdered by British troops in Iraq nine years ago opened in London on Monday. The Al-Sweady Inquiry, named after one of the dead men, 19-year-old Hamid Al-Sweady, will examine claims that British soldiers unlawfully killed detainees following a gun battle at a checkpoint in Maysan Province, southern Iraq, in May 2004. It will also look into allegations that detainees captured at the same time were mistreated at a British base, Camp Abu Naji, and at a detention facility at Shaibah Logistics Base between May and September that year.