Four people have been injured in clashes between police and hundreds of immigrants in the Greek port of Patras last week.
The confrontation occurred after an Afghan migrant was seriously injured trying to jump onto a moving truck bound for Italy.
After he fell from the truck, fellow Afghans attacked the driver and also clashed with police officers who rushed to the scene.
Police dispelled hundreds of immigrants with tear gas as they demonstrated in the streets and set fire to garbage cans, causing traffic jams for several hours.
The injured Afghani was later transferred to hospital in a serious condition.
Patras is home to a large number of illegal immigrants who hail from Afghanistan and are aged between 15 and 25 years.
Many live in makeshift camps without proper water or hygiene facilities.