People gathered under the bridge, which was still under construction, and along the riverbed to celebrate "Nature Day," Iranian state media reported. Earlier on Thursday, President Trump mentioned in a social media post the strike on the B1 bridge, located west of Tehran in the city of Karaj. He called on Iran to "reach an agreement." "The largest bridge in Iran is collapsing and will never be used again—Much more to come!" he said on Truth Social, posting a video of the bridge collapsing.