Migrants and activists gathered outside an immigration centre in Ciudad Juárez, Mexico, where at least 40 people died in a fire to call for justice after CCTV was released appearing to show guards leaving the building while smoke filled a locked cell with detainees inside. Human rights groups have blamed poor conditions and overcrowding for the fire. The Mexican president has said the fire, which broke out late on Monday, was caused by migrants setting fire to mattresses after discovering they were being deported. Activists have frequently called for better conditions in detention centres as the US and Mexico attempt to cope with record levels of border crossings
