Iranian officials blame Saudi Arabia for training and funding the separatist group. Saudi officials haven’t commented on the attack and didn’t respond to questions seeking comment. Late Saturday, Iran’s foreign ministry summoned the ambassadors of Denmark and the Netherlands, where it says people linked to the assailants are based. Iran also called in the chargé d’affaires of the U.K., from where a television station funded by Saudi investors broadcast a statement from al Ahvazieh after the attack. Iran also summoned the chargé d’affaires of the United Arab Emirates over comments made by an unnamed Emirati official, state-run media reported, without elaborating. The U.A.E. is a key ally of Saudi Arabia—which doesn’t have diplomatic representatives in Iran—and both are fighting Iran-supported rebels in Yemen. A soldier carries an injured comrade after the attack in Ahvaz, in which 25 people were killed.