BANGKOK: Thailand’s army accused Cambodia on Monday of violating a newly signed ceasefire agreement, reached after weeks of deadly border clashes, by flying more than 250 drones over its territory.

The Southeast Asian neighbors agreed to the “immediate” ceasefire on Saturday, pledging to end renewed border clashes that killed dozens of people and displaced more than a million this month.

But the fresh allegation from Bangkok and its threat to reconsider releasing Cambodian soldiers held by Thailand left a sustained truce in doubt, even as their foreign ministers wrapped up two days of talks hosted by China.

The Thai army said on Monday “more than 250 unmanned aerial vehicles (UAVs) were detected flying from the Cambodian side, intruding into Thailand’s sovereign territory” on Sunday night, according to a statement.

“Such actions constitute provocation and a violation of measures aimed at reducing tensions, which are inconsistent with the Joint Statement agreed” during a bilateral border committee meeting on Saturday, it said.