A screenshot from a video by NBC News-affiliate KYMA shows a portion of Trump's border wall that has fallen onto a row of trees in Mexicali, on the California-Mexico border.

  • A portion of President Donald Trump's border wall blew over onto the Mexican side due to strong winds, according to NBC News-affiliate KYMA.

  • Video of the event showed the border wall section swaying in the wind as crews tried to stabilise it.

  • The section of the wall was under construction as part of Trump's signature policy. It replaced existing wall rather than extending the overall coverage any further.

  • A Customs and Border Protection agent told CNN that the wall was newly installed and had been set in concrete that had not yet cured.

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A portion of President Donald Trump's border wall blew in strong winds and fell into Mexico, according to NBC News-affiliate KYMA. The border wall collapsed around midday local time on Wednesday, and landed on a row of trees, according to police in Mexicali, a town on the Mexico-California border.

A map of Mexicali, Baja California, Mexico.

The fallen length of wall was around 40 metres long.

Agent Carlos Pitones of the Customs and Border Protection sector in El Centro, California, told CNN that the wall was newly installed and had been set in concrete that had not yet hardened.

According to CNN, the National Weather Service recorded wind gusts up to 60kph when the wall fell down.

Video showed the border wall section swaying in the wind as crews tried to stabilise it.

It was being put up as part of Trump's signature policy to reinforce and extend the physical barrier diving Mexico from the US.

His original ambition to swiftly erect a full new barrier along the entire 3,144-kilometre border has been repeatedly scaled back.

This section of wall was being built to replace a part of the border that already exists.

According to KYMA, nobody appears to have been hurt by the collapse.

In January, the Washington Post reported that the Trump administration was preparing to divert $7.2 billion from the Pentagon's budget to pay for wall-building. 

When Trump visited the $147-million border wall replacement project in Otay Mesa, California, he called the design "amazing" and signed his name in Sharpie pen.

But Trump's border plans have faced criticism both for their cost and effectiveness.

A video that went viral in December showed people easily sliding down the border wall slats like a fireman's pole before running away as a Border Patrol vehicle pulls up.

Other videos have emerged showing people as young as eight-years-old scaling an 5-metre replica of the wall. One man was able to climb while juggling.

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