South Wales Police says the A465 is closed between Aberdulais and Resolven, after a serious crash.
Diversions are in place via the B4242.
More top news
A mild night with showers and dense misty patches!
Before the plane took off on February 16, teacher Juhel Miah was escorted off the flight by security.
Our Valleys Correspondent Hannah Thomas has been spending time discovering why the people who live in the Valleys love their communities.