A Thai F-16 fighter jet bombed targets in Cambodia on Thursday, both sides said, as weeks of tension over a border dispute escalated into clashes that have killed at least nine civilians, including a child.

Of the six F-16 fighter jets that Thailand readied to deploy along the disputed border, one of the aircraft fired into Cambodia and destroyed a military target, the Thai army said. Both countries accused each other of starting the clash early on Thursday.

¡°We have used air power against military targets as planned,¡± Thai Army deputy spokesperson Richa Suksuwanon told reporters. Thailand also closed its border with Cambodia.