A vessel is on fire in the Strait of Hormuz, the UK Maritime Trade Operations agency said on Monday as the US and Iran vied for control over the vital waterway. "UKMTO has received a report of an incident 8NM northwest of Kumzar, Oman. UKMTO have received information from military authorities that a vessel is on fire," the British organisation said in a statement, adding that the cause of the fire has not yet been verified.The cause of the fire has not been verified as this time. Vessels are advised to transit with caution and report any suspicious activity to UKMTO while authorities investigate.