One policeman was wounded as a result of the dawn clash in the mountainous northern region of Epire which borders Albania, the source said, requesting anonymity.
The source did not reveal the name of the suspect, but said he was one of the 11 mostly Albanian inmates who shot their way out of a prison in the central town of Trikala on March 23, wounding two guards.
In that incident the helicopter made an emergency landing in the prison courtyard after it was caught in the crossfire between the armed men on board and prison guards.