A massive explosion and fire at Iran’s Shahid Rajaei port on Saturday killed 25 people and injured around 800, reportedly linked to a shipment of missile fuel chemicals.

The blast occurred as U.S.-Iran nuclear talks took place in Oman.

Although Iranian officials denied missile fuel was involved, reports suggest the fire stemmed from mishandling solid rocket propellant, the Associated Press has reported.

The fire was brought under control by Sunday, but authorities warned of chemical pollution, closing schools and offices in nearby Bandar Abbas.

Written by B.C. Begley