The United States has deployed a fleet of robot subs in the Gulf to prevent Iran from blocking the strategic Strait of Hormuz with mines in the event of a crisis, officials have said.

The “SeaFox” drone “has been deployed in the Fifth fleet AOR,” which includes the Persian Gulf and the Arabian Sea, a Navy official said, confirming information first reported in the Los Angeles Times newspaper.

The undersea drone, about 1.2 metres long and equipped with a camera and sonar, is guided by a cable from a ship.

German manufacturer Atlas Electronik says the drone has a range of about 1,000 metres and carries an explosive to destroy mines. “SeaFox devices will be employed from MCMs,” or mine counter-measure ships, in the Persian Gulf, the Navy official said.

Fears of a closure of the Straight of Hormuz – through which about a fifth of the world’s traded oil passes – intensified earlier this year after Iran threatened to close it if Western governments kept up efforts to rein in Tehran’s controversial nuclear programme by choking off its oil exports.

In response, the US military has been bolstering its presence in the region. It sent four mine sweeper ships in early June, joining four other mine sweeping vessels already in the region, according to the Fifth Fleet. The Navy also has MH-53 Sea Stallion helicopters and USS Ponce, an old amphibious warship that has been converted into a “floating base,” stationed in Bahrain.

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