Thai fighter jets dropped bombs on Cambodian military targets along their disputed border on Thursday, as armed clashes between the two Southeast Asian neighbors killed at least eight civilians, in a dramatic escalation of tensions that threatens to erupt into a broader conflict.

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.

Thai F-16 fighter jets struck military sites in neighboring Cambodia as a border dispute between the Southeast Asian nations, stretching back decades, erupted in fresh violence that killed at least 11 people.