Iranian authorities have arrested 28 people linked to the Daesh group for plotting to target Tehran during the anniversary of last year’s protests, the intelligence ministry said on Sunday.

The protests erupted after the death in custody on September 16, 2022, of Mahsa Amini, a 22-year-old Iranian Kurd arrested for allegedly flouting the Islamic republic’s strict dress code for women.

“In recent days, during a series of simultaneous operations in Tehran, Alborz and West Azerbaijan provinces, several terrorist bases and team houses were attacked, and 28 members of the said terrorist network were arrested,” the ministry said on its website.

“These elements are affiliated to the professional crime group of Daesh (Daesh group) and some of them have a history of accompanying takfiris in Syria or being active in Afghanistan, Pakistan and the Kurdistan region of Iraq,” it added.

In Shiite-dominated Iran, the term “takfiri” generally refers to jihadists or proponents of radical Sunni Islam.

The intelligence ministry said two security personnel were wounded during the arrest operations, and a number of bombs, firearms, suicide vests and communications devices were seized.

It said it had neutralized a plot to “carry out 30 simultaneous terrorist explosions in densely populated centers of Tehran to undermine security and incite riots and protests on the anniversary of last year’s riots.”

The months-long demonstrations saw hundreds of people killed, including dozens of security personnel, in what Tehran called “riots” fomented by foreign governments and “hostile media.”

On Thursday, a court sentenced to death a Tajik Daesh member convicted over a deadly gun attack on a Shiite Muslim shrine last month.

The attack on the Shah Cheragh mausoleum in Shiraz, capital of Fars province in the south, came less than a year after a mass shooting at the same site that was later claimed by the Daesh group.