May 4 (Reuters) - The United Arab Emirates said its air defences were engaging missile and drone threats on Monday evening as firefighters battled a blaze at a major oil industry zone following a drone attack which authorities said had originated from Iran.
The Gulf Arab state's foreign ministry said in a statement that the attacks marked a serious escalation and posed a direct threat to the country's security, adding that the UAE reserved its "full and legitimate right" to respond.
Multiple flights bound for the UAE diverted to Muscat in Oman, while other inbound aircraft circled over Saudi Arabia, according to flight tracking service Flightradar24, as the attacks caused widespread disruption to air traffic.
Iranian state media, citing a senior military official, said Iran had no plan to target the UAE, whose defence ministry said earlier on X that it had intercepted three Iranian missiles over its territorial waters and a fourth crashed into the sea.
The drone attacks shattered a period of relative calm in the region since a Pakistani-mediated ceasefire between Washington and Tehran took effect on April 8, pausing more than a monthof intense fighting in the Gulf region.
Civil defence teams were deployed immediately to contain the blaze at the Fujairah Oil Industry Zone, the Fujairah Media Office said in a statement, adding that three Indian citizens were moderately injured in the attack and taken to hospital.
By Monday evening, the ministry said air defence systems were actively engaging further missile and drone threats.
"All airports in the UAE are closed for the time (being)," the captain on one inbound flight to Dubai told passengers, adding that aircraft would be diverted to the Omani capital.
Iran's Revolutionary Guards Navy issued a map it said showed an expansion of areas under Iranian control near the Strait of Hormuz, encompassing the UAE ports of Fujairah and Khorfakkan as well as the coast of the Umm Al Quwain emirate, Iranian news agencies reported.
During the period of intense conflict earlier this spring, the UAE said it had intercepted and destroyed thousands of drones and missiles.
UAE authorities on Monday issued mobile phone alerts in Dubai and Abu Dhabi warning of the possibility of missile attacks.
Monday's strike was not the first time Fujairah's energy infrastructure had been targeted. A drone attack on March 14 had previously hit the Port of Fujairah, triggering fires and the suspension of some oil-loading operations.
Fujairah has been critical to UAE oil exports during the Iran war as it sits at the end of the Abu Dhabi Crude Oil Pipeline, which carries crude from inland fields to the Gulf of Oman, bypassing the Strait of Hormuz.
This has allowed the UAE to continue shipping oil to global markets even as the waterway remained under threat.
(Reporting by Reuters bureaus; Editing by Alexander Smith)
