Thailand and Cambodia have accused each other of new attacks as border clashes continue for a third day, leaving at least 33 people dead and over 168,000 displaced as international pressure mounts to reach a ceasefire.

The deadliest conflict between the two nations in 14 years, now in its third day, extended to provinces about 200 miles south of where clashes first began.

Armed clashes on the remote, disputed border between Cambodia and Thailand have killed at least 12 people on Thursday, in a dramatic escalation of tensions that threatens to erupt into a broader conflict.