Iran’s intelligence minister said on Saturday the mastermind behind Wednesday’s attacks in Tehran, which killed 17 people, had been killed by security forces.

“The mastermind and main commander of terrorist attacks on the parliament and Mausoleum of Ayatollah Khomeini was killed today by the security forces,” Mahmoud Alavi, minister of intelligence, was quoted as saying by Tasnim news agency.

The Islamic State of Iraq and the Levant (ISIL, also known as ISIS) group had claimed responsibility for the attack, by suicide bombers and gunmen.

A number of arrests were made after the deadly attack on the parliament and Mausoleum of Ayatollah Khomeini.

Addressing a ceremony in Tehran early on Saturday, Brigadier General Ashtari said a number of fighters affiliated with armed groups have been arrested, local media reported.