An explosion that hit a building in the southern Iranian port city of Bandar Abbas on Saturday was caused by a gas leak, according to a preliminary assessment, the local head of the fire department said. Earlier, Iranian state media reported that at least one person had been killed and 14 injured in the blast, which comes amid heightened tensions between Tehran and Washington over Iran’s crackdown earlier this month on nationwide protests and over the country’s nuclear programme. “This [gas...