Multiple weapons experts have disputed a US claim that Iran may have been responsible for a deadly strike on the town of Lamerd on the first day of the war.
Six experts - who examined footage of the strike and all commented independently - contested the US suggestion that it was an Iranian missile, citing the missile's visual features, the way it exploded, its trajectory and the number of strikes in the area as the basis for their analysis.
Iranian officials have said 21 people, including four children, were killed.
BBC Verify originally reported on the strikes on 28 March, citing experts who said it was likely a US Precision Strike Missile (PrSM) was used. The US Central Command (Centcom) - which oversees US military operations in the Middle East - declined to comment for that report.
Centcom then released a statement on 31 March denying it was a US missile, instead saying that footage of the attack was consistent with an Iranian Hoveyzeh cruise missile.
"US forces do not target civilians, unlike the Iranian regime which has attacked civilian locations in neighboring countries more than 300 times," the statement added.
When BBC Verify went back to Centcom with the experts' analysis, it said it had "nothing to add" to its original statement.
Since our initial investigation, BBC Verify has confirmed additional footage that shows there were three separate strikes on a sports hall, a residential area and near an educational centre in Lamerd that day.
"While it is feasible that an Iranian cruise missile could malfunction, it is a bit beyond credulity to have a number of them fail above the same location at the same time," said an analyst from McKenzie Intelligence.
Experts also say the munition in the verified CCTV footage does not appear to be damaged, malfunctioning or intercepted.