Iran arrests 50 after Tehran IS attacks

Iran has arrested almost 50 people in connection with twin attacks on Tehran that killed 17 people last week, officials said, as security forces stepped up efforts to crack down on suspected militants. Islamic State claimed responsibility for the suicide bombings and gun attacks on parliament and the mausoleum of the Islamic Republic's founder, Ayatollah Ruhollah Khomeini, on Wednesday. Iran also said its security forces killed the mastermind of the attacks on Saturday.