More than 150 migrants have been rescued after the boat they were using to cross the Channel caught fire on Tuesday morning, French authorities have said.

The boat was attempting to cross to the UK when its engine caught fire, according to the French maritime prefecture of the Channel and North Sea.

It said 157 people have been rescued and are being taken to port in Boulogne-sur-Mer. There are no reports of anyone having been injured or killed.

It comes just a day after Prime Minister Andy Burnham pledged his government will be “relentless” in curbing the number of people arriving in the UK on small boats.

French authorities said the boat left France on Monday night.

Overnight “five people on board the vessel required rescue… the remaining people on board refused the assistance offered by the French patrol boats”, the French maritime prefecture said.

“Determined to reach the United Kingdom, migrants crossing the Channel in small boats refused assistance offered by French emergency service, accepting it only in situations of extreme emergency,” it said in a statement.

Because of the “structural fragility” of boats used to cross the Channel, it said they decided not to intervene further at that stage.

But this morning the engine caught fire and the “vessel’s integrity deteriorated very rapidly”.

Rescue boats went to the scene from France and the UK, including the RNLI Eastbourne lifeboat and the UK Border Force vessels BSC Contender and BSC Courageous.

Two French boats rescued 103 migrants and the British boats rescued 54.

All of them are being taken to Boulogne-sur-Mer for treatment, where they were expected to arrive there at 12:30 local time (11:30 BST) on Tuesday.

A UK government spokesperson said the Border Security Command was alerted to an incident in the Channel this morning “concerning a migrant small boat in distress in French waters”.

It said British vessels assisted in the operation, adding that so far there have been no fatalities reported.

They added that the incident “underlines the terrible dangers of small boat crossings”.

“We continue to work relentlessly with the French and our partners overseas to prevent these perilous journeys,” they said.

Earlier, the UK Coastguard said: “A vessel caught fire earlier this morning whilst in the French search and rescue region. UK vessels and a lifeboat are assisting.”

Reform UK leader Nigel Farage said in a post on X: “We must put a stop to this. Our plan will save lives.”

Earlier this week, his party said if in government it would deploy the navy to ward off crossings.

Political discussions around the UK’s policies on illegal migration have resurfaced since tens of thousands of migrants swam into the Spanish exclave of Ceuta on Thursday.

The Conservatives have said that Labour has not delivered on its promises on migration, while the Lib Dems said the government should increase efforts to improve relationships with Europe and cut down the asylum backlog.

The number of migrants who have arrived in the UK on small boats since Burnham became prime minister a fortnight ago surpassed 2,000 on Saturday.

Last Wednesday was the busiest day for crossings so far this year, with 752 migrants arriving in the UK.

Most people attempt the crossing in the summer when conditions are better. It’s also become the most common way for people to be detected entering the UK illegally.

Home Office figures show the number of crossings so far this year are down about 43% compared to this time last year. The number peaked in 2022 and has been on a downward trend ever since.

During a visit to Dover on Monday, Andy Burnham said progress had been made in curbing the number of people arriving in the UK on small boats.

The prime minister said “people want to see this issue addressed”.

He added that enforcement officers tackling people-smuggling gangs have been doubled on both sides of the Channel, but “a system that offers safe routes for people” needs to be built as well.

In April, the UK and France struck a £662m (773m euro) deal aiming to stop illegal migrants from crossing the Channel.

The three-year agreement included plans to send riot-trained police to French beaches to tackle violence and “hostile crowds”, as well as France deploying millions of pounds of drones and two helicopters as part of a system to intercept people smugglers and illegal migrants.

UK ministers have also said about £100m in funding could be redirected or withdrawn after a year if not enough journeys are stopped – but the government has not confirmed what targets the French would have to meet.