TEHRAN: Iran has tracked down and killed several suspected jihadists including the alleged mastermind of twin attacks in Tehran last week, a security official and a minister have said. Dozens of suspects have been arrested since the attacks on Wednesday killed 17 people in the first assault in Iran to be claimed by the Islamic State jihadist group. Police late Sunday killed four IS suspects in the southern province of Hormozgan, the ISNA news agency on Monday reported police chief Azizollah Maleki as saying. Iran has said five Iranians, who had joined IS and traveled to its Iraq and Syria bastions, carried out Wednesday’s attacks on the parliament and the shrine of revolutionary leader Ayatollah Ruhollah Khomeini. Late Saturday, Intelligence Minister Mahmoud Alavi said the alleged mastermind behind the attacks had been tracked down and killed outside the country.