Denmark recalled its ambassador to Iran Tuesday after accusing Iran of planning to kill three of its citizens who were living in Denmark.

“Denmark can in no way accept that people with ties to Iran’s intelligence service plot attacks against people in Denmark,” Danish Foreign Minister Anders Samuelsen told reporters in Copenhagen.

Danish intelligence agency PET accused Tehran of plotting the attack in Denmark on three Iranians who were suspected of being members of the separatist group Arab Struggle Movement for the Liberation of Ahvaz, said Danish security service chief Finn Borch Andersen. Andersen said the plot was planned in retaliation for a deadly attack in Iran in late September.

A Norwegian citizen of Iranian descent was arrested on October 21 on suspicion of helping an unnamed Iranian intelligence service “to act in Denmark,” Andersen said. Anderson also said the suspect was allegedly involved in the plot.

That suspect, whose name was not disclosed, has denied wrongdoing, as has Iran’s Foreign Ministry. The suspect was detained in Sweden, according to the Swedish security service SAPO.