Thailand has accused Cambodia of violating a ceasefire agreement reached on Monday after days of deadly clashes along their disputed border, but negotiations between the two sides will continue.

Thailand launched air strikes on Cambodian military targets on Thursday as Cambodia fired rockets and artillery, killing at least 11 civilians, in a dramatic escalation of a long-running border row between the two neighbours.

Both nations accused each other of starting the military clashes and have downgraded their diplomatic relations since Wednesday. Thailand also sealed all land border crossings with Cambodia.