The UN says, the air strike which killed more than 44 migrants at a detention centre on the outskirts of the Libyan capital Tripoli may amount to a war crime. <br />'' <br />'' More than 130 people were also injured in the strike. <br />'' <br />''  An airstrike hit a detention centre for migrants in Tripoli early this morning.  <br />'' <br />'' The UN-supported government blamed the self-styled Libyan National Army led by Khalifa Hifter for the airstrike. Most of the dead are believed to be sub-Saharan Africans.<br />'' <br />'' The Libyan National Army launched an offensive against the government in April. Hifter's forces control much of the country's east and south. <br />'' <br />'' Last week, the government reclaimed the strategic town of Gharyan, about 100 kilometres from the capital city of Tripoli.  <br />'' <br />'' Gharyan had been a key supply route for the militant forces. Thousands of migrants are held in government-run detention centres.<br />