The Latest: Iran says US ally behind military parade attack

The Latest on the fallout from Saturday's attack on a military parade in Iran (all times local):

11 a.m.

Iran's President Hassan Rouhani claims an unnamed U.S.-allied country supports the group that attacked a military parade on Saturday.

Rouhani said Sunday that the U.S. supports small nations in the southern Persian Gulf that in turn back the militants behind the attack. He did not identify the attackers. Arab separatists claimed the assault, which killed at least 25 people and wounded more than 60, and Iranian officials appear to have accepted the claim.

Rouhani could have been referring to Saudi Arabia, the United Arab Emirates or Bahrain, all of which are close U.S. military allies. He says Iran will respond to the attack in a lawful way.

Saudi Arabia, Bahrain and the UAE view Iran as a regional menace and have long accused it of meddling in other countries' affairs. Iran backs militant groups across the region.

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6:45 a.m.

Iran has summoned diplomats from Britain, Denmark and the Netherlands over allegedly harboring "members of the terrorist group" that launched an attack on a military parade in the country's southwest.

A statement early Sunday from Iran's Foreign Ministry also quoted ministry spokesman Bahram Qasemi as saying Danish and Dutch diplomats were told Iran "already warned" their governments about this.

The statement also criticized Britain over a Saudi-linked, Farsi-language satellite channel immediately airing an interview with an Ahvazi separatist claiming the attack.

Saturday's attack in Ahvaz killed at least 25 people and wounded over 60.

Arab separatists in the region claimed the assault and Iranian officials believe they carried it out. The Islamic State group also claimed the attack, but initially offered incorrect information about it and provided no proof.