A leaking chemical tank at an industrial site in southern California has triggered mass evacuations amid fears of a major explosion.
More than 50,000 residents were ordered to leave as authorities warned of a potential Boiling Liquid Expanding Vapor Explosion.
The tank, containing chemicals used in aircraft production, overheated before developing a crack that may have eased pressure.
Officials continue monitoring the risk, while evacuees face uncertainty over safety and their return home.