The clashes came despite reassurances from Thailand and Cambodia earlier on Sunday that they were working to defuse border tensions. Thousands of Thais have been evacuated and Cambodian traders are moving out of the area. There are reports reinforcements are being sent into the area despite and earlier agreement not to. Cambodian Prime Minister Hun Sen is asking for UN involvement.
Because of the possibility of fighting erupting at any time, even when (and if) a holding ceasefire goes in place travelers are highly recommended to avoid traveling to the area until hearing otherwise.
Please see our earlier updates for more details on what has been happening and the source of the conflict. This Reuters article, Why Are the Thais and Cambodians Fighting, is also a helpful summary of the conflict.