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A huge blast on Saturday likely caused by the explosion of chemical materials stored at Iran's biggest port, Bandar Abbas, killed at least four people and injured more than 500, Iranian state media reported.
The explosion, which hit the Shahid Rajaee section of the port, occurred as Iran began a third round of nuclear talks with the United States in Oman, but there was no immediate indication of a link between the two events.
Hossein Zafari, a spokesperson for Iran's crisis management organisation, appeared to blame the explosion on poor storage of chemicals in containers at Shahid Rajaee.