AFP reporters heard explosions in Doha and Bahrain's capital Manama, while authorities in the United Arab Emirates and Saudi Arabia said they had responded to missile threats.

The overnight attacks came hours before a US deadline warning Iran to reopen the Strait of Hormuz or face devastating strikes on its civilian infrastructure.

Qatar's interior ministry said the authorities were "dealing with an incident" after debris from intercepted Iranian missiles fell on a home in the Muriykh area of west Doha.

"The incident resulted in the recording of four moderate injuries, including a Qatari child," the statement added.

The UAE's ministry of defence said in a statement that its military was "dealing with missile and drone attacks coming from Iran".

Saudi Arabia's defence ministry spokesperson announced the "interception and destruction of five ballistic missiles launched towards the eastern region", after overnight attacks the previous day hit a petrochemical complex in the eastern city of Jubail.

Gulf countries have faced repeated drone and missile salvos from Iran over recent weeks in response to the US and Israeli strikes that began at the end of February.

Iran has targeted fossil fuel infrastructure in the oil-rich Gulf nations while effectively closing the strategic Strait of Hormuz to shipping, through which one-fifth of global oil usually passes.