Iran tight-lipped on cause of deadly port explosion that killed at least 40 people

By Leila Gharagozlou, Tim Lister, Eve Brennan and Frankie Vetch, CNN (CNN) — Iranian authorities have not said what caused the massive explosion at the port of Bandar Abbas on Saturday, killing at least 40 people, amid unconfirmed reports of the possible presence of a chemical used to make missile propellant. Eyewitness accounts and video indicate chemicals in an area of shipping containers caught fire, setting off a much larger explosion. The death toll has spiked sharply, with 1,000 others reported injured, according to the Associated Press, citing Iranian state TV. Of those wounded, 190 remain in hospital, said Pir…