Thailand launched airstrikes along the disputed border with Cambodia on Monday as both sides accused the other of attacking first.

Tensions have simmered since the Southeast Asian neighbors signed a truce agreement in October pushed by U.S. President Donald Trump after their territorial disputes led to five days of combat in July that killed dozens of soldiers and civilians.

The U.S.-brokered ceasefire that ended the brief conflict was threatened last month after Thai troops were injured by land mines.

Both sides continue to trade accusations over responsibility, even as they are supposed to be cooperating in getting rid of the mines.

Trump said in mid-November he'd stopped a war between them as the tensions simmered.