The A40 between Brecon and Bwlch is closed after three people were injured in a road accident.
Police are currently investigating the incident, which took place at around 3pm this afternoon.
Two vehicles were involved in the collision. Three casualties have been taken to hospital for treatment.
The road is currently closed with diversions in place on the A40 at Bwlch and at Brynich roundabout junction with the A470.
Motorists are advised to avoid the area and take alternative routes.
Anyone who witnessed the collision is asked to contact Mid Wales Roads Policing unit on 101.
The Prince of Wales and the Duchess of Cornwall are in Brecon today on the last day of their summer tour of Wales.
The royal couple made a special visit to the recently-restored 17th century Plough Chapel.
It's the final day of the Prince of Wales and Duchess of Cornwall's Summer tour of Wales.
Today the royal couple will visit the recently-restored 17th century Plough Chapel in Brecon.
The Grade II listed building takes its name from an old pub which used to stand on the site. The Chapel acts as a popular concert venue as well as holding regular services.
In August each year, the Chapel plays a key role in the Brecon Jazz Festival, traditionally hosting a Jazz concert and Songs of Praise.
Three soldiers who died while on an SAS selection exercise in the Brecon Beacons died from 'overheating,' a pre-inquest hearing has been told.
Lance Corporal Craig Roberts, 24, from Penrhyn Bay, Lance Corporal Edward Maher, 31, and Corporal James Dunsby, 31, from Bath, died last summer. They had taken part in a 40-mile hike in temperatures reaching 29C on 13th July.
The Crown Prosecution Service is expected to discuss whether to pursue gross negligence manslaughter with the soldiers' families and a decision will be made by the end of the month.
Witnesses at the time reported seeing soldiers on training exercise in distress and pleading for water in the Welsh valleys. A pre-inquest hearing in Solihull this morning was told the three soldiers died from the effects of hyperthermia.
The Prime Minister has paid tribute to five soldiers killed last weekend in a helicopter crash in southern Afghanistan.
Captain Thomas Clarke from Cowbridge and Lance Corporal Oliver Thomas from Brecon were in a Lynx helicopter. They were with three colleagues when it came down.
A teacher has paid tribute to Lance Corporal Oliver Thomas, 26 from Brecon.
Nick Dinsdale taught the serviceman at Lady Hawkins School in Hereford and described the soldier as an exceptional student.
"He was academic, sporting and exceptional in every way. He was head boy and a great ambassador for the school".
Cowbridge rugby coach Richard Killock has paid tribute to Captain Thomas Clarke.
Richard Killock coached the serviceman as a junior describing him 'as a very good rugby player, totally tough and committed but off the pitch he was as gentle as they come.'
Captain Clarke, 30, from Cowbridge, enlisted as an army officer in May 2007, undertaking officer training at the Royal Military Academy Sandhurst. He then joined the Army Air Corps as a pilot.
The Deputy Prime Minister, Nick Clegg, has paid tribute to one of the men who died in a helicopter crash in Afghanistan.
In a statement, he said: "My heartfelt sympathies go to the family, partner, friends and colleagues of Oliver Thomas.
"Oliver, or Olly as he was known, was taking a break from his role as a researcher in Westminster to Roger Williams. I understand from Roger that Olly was an incredibly popular and dedicated member of staff who will be greatly missed.
"It is very sad to hear about the death of a young man who had a promising future ahead of him. It is even sadder for those colleagues of Olly in the Liberal Democrats who have lost a fellow activist and dear friend".
The families of Captain Thomas Clarke and Lance Corporal Oliver Thomas have paid tribute to them in statements released by the Ministry of Defence.
We cannot express enough our devastation at the loss of a truly wonderful husband, son, brother and friend. Tom brought so much happiness and love to everyone he knew with his sparkling blue eyes and cheeky smile.
He had an absolute passion for life and was the best part of us; we are all poorer today without him. We carry your heart, we carry it in our heart.
Oliver was a truly amazing person, living his life to the full, while fulfilling some of his many dreams and adventures. He was very much loved and will be greatly missed by grieving family and friends.