Police said they arrested about 50 protesters who managed to get past security, including a high fence that surrounds The Hague headquarters of the Organization for the Prohibition of Chemical Weapons, spokesperson Dick Goijert said.

A Kurdish group called DEM NED organized the protest against the alleged use of chemical weapons by the Turkish armed forces, Goijert said. He did not have further details, the New Arab news website reported.

The Kurdistan Workers' Party (PKK) issued a statement on Thursday alleging Turkey has repeatedly used chemical weapons in northern Iraq. Turkey denies it uses chemical weapons in its conflict with the group.

Photos from the protest published by Dutch media outlet Regio 15 showed at least a dozen police vehicles lined up outside OPCW headquarters and dozens of protesters outside the building holding up banners and flags.

The watchdog agency did not immediately respond to a request for comment. Organizers of the protest could not be reached.

Turkey has carried out numerous cross-border incursions into northern Iraq over the years to fight the PKK, which maintains bases in the region.

Tens of thousands of people have been killed since the group began an insurgency in Turkey’s Kurdish-dominated southeast region in 1984.

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