French prosecutors launched an investigation Saturday after dozens of demonstrators were seriously wounded, including an Anadolu Agency’s journalist, when police used excessive force against protestors in the capital, according to media reports.

Investigators from the national police unit are focusing on the Magenta Boulevard in Paris where demonstrators were hurt.

Anadolu Agency photographer Mustafa Yalcin was wounded Thursday when he was hit by a plastic hand grenade fired by police.

Yalcin underwent a six-hour-operation to his injured left eye at Cochin Hospital and faces the risk of permanent eyesight loss.

Read more: Prosecutors probe French police after injuries