Muslims in a northeastern neighborhood of India’s capital returned for weekly prayers at fire-bombed mosques on Friday, two days after a 72-hour clash between Hindus and Muslims that left at least 40 dead and hundreds injured. Five days after they started, authorities have not said what sparked the riots — the worst communal violence in New Delhi in decades — hospitals were still trying to identify all the dead, and the toll continued to rise. Tensions between Hindu hard-liners and Muslims protesting Prime Minister Narendra Modi government’s Hindu-first policies had been building for months when the violence exploded Sunday night, on the eve of U.S. President Donald Trump’s first state visit to India.