A still from a video shared by President Donald Trump on Truth Social, showing an explosion on a bridge in Iran/Donald Trump / Truth Social

US President Donald Trump has shared a video on social media of a strike on a bridge in Karaj, Iran.

Video shows the bridge going up in a fiery plume of smoke after an airstrike earlier today. The Israeli Defense Forces had previously told the BBC that they were unaware of the strike.

Trump is now seemingly claiming US responsibility for it.

"The biggest bridge in Iran comes tumbling down, never to be used again — Much more to follow! IT IS TIME FOR IRAN TO MAKE A DEAL BEFORE IT IS TOO LATE, AND THERE IS NOTHING LEFT OF WHAT STILL COULD BECOME A GREAT COUNTRY!" the president wrote on his platform Truth Social.

Iranian media reported two people were killed in the strike.

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The US Defence Department has not responded to a request for comment.

The bridge appears to have been attacked in two separate incidents as another clip, which has since been shared by Trump, shows a different large blast.

In the video, filmed from much further away, a significant section visibly collapses - and an even large plume of smoke is already rising as in the first clip.

BBC Verify has examined two videos which appear to show separate air strikes on a bridge under-construction in Karaj, a city just west of Iran’s capital Tehran.

The verified video of the first attack shows the B1 bridge at the moment of a huge explosion on it. There is already a smoke plume rising nearby before the fireball, suggesting there may have been multiple strikes.

We have also verified images showing the aftermath this initial attack, which Iranian officials say killed two people.

The pictures show a large gap in the bridge and construction cranes visible either side of it.

BBC Verify has confirmed this is a new gap by checking satellite images captured in January, which show the span of the bridge intact.