A470 Powys - A470 closed in both directions between the A4215 junction in Libanus and Cefn Coed Roundabout in Merthyr Tydfil, because of accident investigation work. Diversion in operation - from the Merthyr side, to head east on A465 to the Hardwick roundabout then head north on the A40 towards Brecon. Heading from Brecon vice versa. Police directing traffic. Also affecting A4059 between Nant-Ddu and Penderyn.