Thailand and Cambodia exchanged heavy artillery fire for a second day on Friday as their worst fighting in over a decade intensified and spread to new areas, despite international calls for a ceasefire.

The current clashes erupted on Thursday with an exchange of fire near Prasat Ta Muen Thom, an ancient temple claimed by both nations. It followed two months of tensions over contested territory that began in late May after a Cambodian soldier was killed in a skirmish.

Fighting between Thailand and Cambodia over disputed border areas has entered a second day, leaving at least 15 dead and displacing more than 60,000 people.