On Sunday, Iran executed a man who was convicted of being a member of the Sunni militant group Jaish al-Adl and participating in attacks on security forces in the southeast, according to the judiciary.

Amer Ramesh was arrested during a counterterrorism operation in the Pirsahrab area of Chabahar county in Sistan-Baluchistan province, the judiciary's Mizan Online website said, The Caspian Post reports, citing foreign media.

The dates of his arrest and sentencing were not immediately clear.

He was convicted of "armed rebellion through bomb attacks and ambushes targeting military forces", as well as membership of Jaish al-Adl, an outlawed militant group designated a terrorist organisation by the United States.

A court sentenced him to death and the ruling was later upheld by the Supreme Court after an appeal by his lawyer, according to the judiciary.

"The execution sentence of Amer Ramesh was carried out early this morning," the judiciary said Sunday.

Iran has carried out a string of wartime executions during its conflict with Israel and the United States, which is currently paused under a ceasefire.

On Saturday, Iran executed a man accused of carrying out a "mission" on behalf of Israel's spy agency during mass protests in January, the judiciary said.

Iran is the world's second most prolific user of the death penalty after China, according to rights groups including Amnesty International.

Sistan-Baluchistan province, which borders Pakistan and Afghanistan, has long been a flashpoint for clashes between Iranian security forces and armed groups, including drug traffickers and separatists.

The province, which is home to a large Sunni Muslim Baluch minority, is one of the poorest regions of Shia-majority Iran.