Greek police have arrested two Iraqi men, aged 22 and 28, in the eastern border town of Alexandroupoli on suspicion of being jihadists, state-run radio reported on Sunday.
It is the second such arrest in the area in the past two weeks. The two are suspected of carrying gear that could be used for sniper rifles.
Police also discovered "several firearms and substantial ammunition" in the caravan the pair lived in, a police officer told dpa.
The two are believed to have been carrying British passports which were being checked for validity, the officer said. There was no immediate official confirmation of this information.
At the end of January Greek police arrested two suspected jihadists at the Turkish border.