Iranian security forces shot dead six militants in a clash in southeastern Iran on Saturday, a day after five police officers were killed by armed rebels in the restive region, the official news agency IRNA reported.

IRNA said evidence showed the group was linked to Israel and may have been trained by Israel's Mossad spy agency. There was no immediate Israeli reaction to the allegation.

Another two members of the militant group were arrested, the report said. All but one of the militants were foreign, it added, without giving their nationality.

Iranian police said this month they had arrested as many as 21,000 suspects during the 12-day war with Israel in June.

Iran's southeast has been the scene of sporadic clashes between security forces and armed groups, including Sunni militants and separatists who say they are fighting for greater rights and autonomy.

Tehran says some of them have ties to foreign powers and are involved in cross-border smuggling and insurgency.