Cambodia says Thailand has launched more airstrikes as heavy fighting flares along their border. Both countries accuse each other of violating sovereignty.

Thailand and Cambodia held talks on Thursday to open a border crossing as their conflict extended into a fourth day, with both countries still waiting to hear from U.S. President Donald Trump, who says he believes he can put a stop to the fighting.

The escalation broke the ceasefire brokered in July by Trump who threatened to halt trade talks with the two countries unless they ended the fight.

SURIN, Thailand (AP) — Cambodia’s Senate President Hun Sen vowed a fierce fight against Thailand as a second day of widespread renewed combat between the nations Tuesday drove tens of thousands of people to flee border areas.