Independent Ian Johnston and Labour’s Hamish Sandison go through to a second round of voting, Political Editor Adrian Masters confirms.
In the first round, Mr Johnston is leading Mr Sandison by 495 votes.
A 'detailed inquiry' will held into the Police and Crime Commissioner polls. In Gwent, only 14.3% voted - many places saw no ballots at all.
Independents take North Wales and Gwent, while the Conservative candidate wins in Dyfed Powys. Labour wins in the South Wales region.
Counting will get underway later this morning, in elections for new Police and Crime Commissioners for each of Wales' forces.