Greek police were hunting three foremen on Thursday who were suspected of shooting and wounding more than 20 migrant workers at a strawberry farm.
The supervisors were believed to have opened fire on Wednesday at a crowd of about 200 mostly Bangladeshi immigrants who were demanding wages that had not been paid, police said.
The wounded people were taken to hospital but none of the injuries were serious.
Anti-foreigner sentiment has been rising in Greece, where one in four workers is unemployed after five years of recession.
Police said they had arrested the owner of the farm, in the southwestern town of Manolada, and were still hunting the foremen.
Reuters