Police in Greece say three migrants were injured when the truck in which they were riding with 38 others crashed through a fence and collided with a parked car outside a town near the Greece-Turkey border.
Police said the truck's 27-year-old Afghan driver was arrested after the accident outside Didymoticho on Saturday.
They say the 41 passengers are from Iraq, Syria, Afghanistan and Palestine and had crossed the nearby river border before they were picked up.
The people injured were taken to a hospital. One is a minor.
Also Saturday, police arrested a 23-year-old and a 28-year-old who allegedly helped nine fellow Pakistanis cross the border on a plastic boat.
Police reported Sunday that the number of migrants detained for entering Greece illegally has risen sharply so far this year.