A large explosion caused by an “unsuccessful” drone attack on a defence factory rocked the Iranian city of Isfahan late on Saturday night. “One of [the drones] was hit by the…air defence and the other two were caught in defence traps and blew up,” Iran’s defence ministry said in a statement. “Fortunately, this unsuccessful attack did not cause any loss of life and caused minor damage to the workshop’s roof.” The Iranian defence ministry offered no information on who it suspected was behind the attack that caused no casualties and only minor damage to the defence factory’s roof. The strike co…