Iranian police on Wednesday questioned four people as part of investigations into a powerful explosion that killed 19 people at a Tehran clinic the night before, state media reported. The blast at the Sina At’har health centre in the upmarket northern neighbourhood of Tajrish caused damage to nearby buildings and sent a plume of thick black smoke into the sky. It was the second such incident to hit Tehran within days, after a gas tank explosion near a military complex east of the capital late last Thursday that authorities said caused no casualties.
