State-of-the-art US missiles were likely used in a deadly strike on a residential area of Iran last month, according to an analysis of footage by weapons experts.
The analysts said a projectile visible in footage of the strike on residential buildings in the southern town of Lamerd was likely a Precision Strike Missile (PrSM). The munition is a new long-range weapon operated by the US military.
According to Iranian state media at least 21 people were killed in at least two strikes on the town that day that hit residential buildings and a sports hall about 300 metres apart.
Centcom - which oversees US military operations in the Middle East - declined to comment.
CCTV footage published by Iranian state media - which was authenticated and geolocated by BBC Verify - shows what experts identify as a likely US munition in flight, moments before it explodes above the target area.
Three analysts at the defence intelligence company Janes and an expert at McKenzie Intelligence said the projectile's shape, length and size of the blast created, and lack of visible nose-mounted controls, indicate the weapon in the verified footage is likely to be a PrSM.
The intended target of the strike may have been an Iranian Revolutionary Guards Corps (IRGC) base located adjacent to the sports hall. While no on-the-ground footage has emerged of the base to show the impact, the building appeared to be undamaged on high-resolution satellite imagery on 9 March.
Videos and photos reviewed by BBC Verify suggest the missile may have also been used in a near simultaneous strike on a sports hall about 300m away from the residential buildings.
One video showed a main road with cars passing by, with the sports hall visible in the background. Moments later, a bright yellow fireball erupts on the sports hall. While the angle of the video does not show the missile, shockwaves appear to shatter the windows of the building across the street and a man is seen running away in panic.
Footage of the aftermath shows the entire side of the building blackened with soot with a plume of smoke rising into the air. Damage could also be seen to the roof and blast fragments surrounded the area.
Among the children killed that day was a 12-year-old girl, Elham Zaeri, according to multiple Iranian state media outlets. Her father described her as an avid volleyball player, who would always turn up to the sports hall 20 to 25 minutes early.
The youngest victim was reportedly two years old.
Days after the strikes a mass funeral procession took place in the city. Footage from the IRGC-affiliated Tasnim news agency, showed hundreds of mourners bowing their heads in front of a group of at least 18 coffins draped in the flag of the Islamic Republic of Iran. Another clip appeared to show that a young child was among those buried.