Cambodia has urged Thailand to return 20 of its soldiers captured after they reportedly crossed into Thai-held territory, hours after a ceasefire ended recent border clashes, Al Jazeera reported.

Defense Ministry spokesperson Maly Socheata said negotiations are underway and called for their safe and immediate return. “We will do our best to continue negotiations with the Thai side to bring all our soldiers back home safely,” she stated.

Thailand confirmed 18 soldiers are in custody and will be returned after legal procedures are completed. Officials say the troops are being treated in accordance with international humanitarian law, according to Al Jazeera.