IRNA � German Ambassador in Tehran Michael Klor Berchtold in a message expressed condolences over Saturday's deadly terror attack in southwestern Iran.

'Just back from Germany, I am shocked to hear about the terrible terrorist attack in #Ahwaz. We express our deepest condolences to the people of #Iran. Our thoughts are with the families affected. We hope everybody injured will recover soon,' Klor Berchtold tweeted on Sunday.

At least 25 people including women and children were killed and more than 60 others injured during September 22 terror attack in Ahvaz which took place during a military parade held to mark the 38th anniversary of an eight-year imposed war against Iran.

The self-proclaimed Saudi-affiliated Al-Ahwaz terrorist group claimed the responsibility for the attack.

Iran's Foreign Minister Mohammad Javad Zarif in a message on Saturday promised swift and decisive response to the terrorist attack.

'Terrorists recruited, trained, armed & paid by a foreign regime have attacked Ahvaz. Children and journos among casualties. Iran holds regional terror sponsors and their US masters accountable for such attacks. Iran will respond swiftly and decisively in defense of Iranian lives,' Zarif tweeted.