A tractor carrying farmworkers overturned in Turkey's northwestern Sakarya province early Friday, killing seven and injuring 20 farmworkers.

The tractor tumbled down a cliff into a stream bed in a tree-covered area located in the Hendek district of the province.

The farmworkers reportedly came from the southeastern Diyarbakır province for seasonal work in Sakarya.

Ambulances were dispatched to transfer the injured to hospitals.

The reason for the accident is being investigated.