Iran summoned envoys from Great Britain, Denmark, and the Netherlands Saturday night.
It was in connection with the shooting at a military parade in which 25 people were killed.
According to Reuters, they were accused of harboring Iranian opposition groups in their countries.
Iran's foreign ministry spokesman referred to terrorist organizations that may have carried out the attack.
It's unacceptable that these groups aren't listed as terrorist organizations by the EU as long as they have not carried out a terrorist attack in Europe. Bahram Qasemi