Geraint Thomas and Chris Froome start Tour of Britain

The Tour of Britain peloton raced past spectators in Carmarthen

Cycling fans lined the streets for the first stage of the Tour of Britain as Geraint Thomas rode in Wales for the first time as Tour de France champion.

The race started at Pembrey in Carmarthenshire and featured four-time Tour de France winner Chris Froome.

Rolling road blocks were put in place along the route and organisers warned roads "would be busy".

The stage finished at about 15:20 BST in Newport and was won by German rider Andre Greipel.

PA Geraint Thomas and Chris Froome in the Tour of BritainPA
Geraint Thomas and Chris Froome were side by side at the start of the race

Thomas has already had a formal homecoming after becoming the first Welshman to win the Tour de France earlier this year when 8,000 fans lined the streets of Cardiff.

Now the double Olympic track champion and multiple Grand Tour winner Froome have raced for Team Sky on the roads around south Wales.

The race started at Pembrey Country Park at 11:00 BST, and included three intermediary sprints in Carmarthen, Llandovery and Usk before the final sprint finish in Newport.

Tour of Britain stage one map
The Tour of Britain stage one route with estimated arrival times of riders
Fans at finish line of Tour of Britain
Crowds in Newport gathered at the finish line to see Andre Greipel sprint to victory

Carmarthenshire council and Newport council both warned of road closures throughout the day.

The stage finished outside the University of South Wales' Newport city campus on Usk Way and the car park at the nearby Friars Walk Shopping Centre both reopened on Sunday evening.

Young fans wait for Geraint Thomas in Brecon
Young fans wait for the cyclists in Brecon

Organisers warned fans taking selfies "that turning your back on the race is never a good idea" as riders pass "very fast".

"We encourage everyone to get behind the riders, but please remember this is their race," race chiefs said in a statement.

"Don't block their route, run alongside them or impede their progress."

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Family of two parents and three children wearing yellow and holding Wales flags
The Chapman and Spencer families were among the thousands of fans wearing yellow in honour of Thomas's victory at Le Tour de France
Crowd outside a chapel in Carmarthen
Fans await the peloton in Carmarthen

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Mark Cavendish, who has won 30 Tour de France stages, and German multiple Tour de France stage-winner Marcel Kittel are both missing this year's eight-stage Tour of Britain.

Former world champion sprinter and Olympic medallist Cavendish, who won a Tour of Britain stage in Wales in 2013 when the fourth leg ended in Llanberis, is ill.

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But multiple Grand Tour stage-winners Andre Greipel of Germany and Slovenia's Primoz Roglic, who finished fourth at this year's Tour de France, are competing.

Although a Tour of Britain stage has passed through Wales in each of the last eight years and ended in Cardiff in 2017, it is the first time the tour has started in Wales since the race began in 1945.

On Saturday, Thomas and Froome warmed up for the race by training with their Team Sky teammates and about 175 children in Maindy, Cardiff - where Thomas got the cycling bug as a child riding with the Maindy Flyers Youth Cycling Club.

Huw Fairclough Geraint Thomas at Maindy in CardiffHuw Fairclough
Geraint Thomas joined children for a training session in Maindy
Huw Fairclough Geraint Thomas and Sky teammates at Maindy in CardiffHuw Fairclough
Thomas brought along some of his Team Sky teammates to Cardiff