Turkish officials say two construction workers are trapped under debris after a landslide at a dam construction site in northeast Turkey.

Adil Sabanci, a regional hydraulic works official, told the state-run Anadolu Agency that two other workers were rescued Friday from the landslide at the Hamzadere Dam construction site in Ipsala, close to Turkey's border with Greece.

Anadolu said the landslide occurred while workers were pouring concrete. Its cause is under investigation.

Despite efforts to improve workplace safety, a monitoring group says close to 1,900 people died in work-related accidents in Turkey last year, most of them at construction sites.