The United States has begun moving several B-2 strategic bombers to the island of Guam in the Pacific Ocean.

It is not immediately clear whether this is in preparation for an attack on Iran, but these bombers are known to be able to deliver special bombs that are the only ones capable of destroying Iran's underground uranium enrichment facility at Fordow.

Two to four B-2 bombers, along with four Boeing KC-46 Pegasus aerial refueling aircraft, took off from Whiteman Air Force Base in the US state of Missouri and are heading for the island of Guam, where the US has both an air and naval base, the Haaretz newspaper reported, citing data from an aircraft tracking application.

Two unnamed Defense Department sources also spoke of the flight of"several" bombers, according to NBC News.

These advanced stealth aircraft are capable of carrying more than 13 tons of GBU-57A/B MOP bombs, specially designed to destroy targets deep underground. According to Sky News, these bombs would be needed to successfully attack the Fordó facility, which is hidden dozens of meters below the mountain.

Reuters sources, speaking on condition of anonymity, declined to provide any further details about the bombers' move, but one said no orders had been issued for further movements away from Guam.

Experts will be watching closely to see if the B-2s move to the US-British military base on the Indian Ocean island of Diego Garcia, which they say is ideally located for operations in the Middle East, according to Reuters.

The deployment of bombers, according to Sky News, suggests that Trump may be ready to strike sooner than expected.

But American television correspondent Mark Stone noted that the B-2 move could be a show of force against China as well as Iran.

Trump, who rarely spends weekends in Washington, is scheduled to return to the White House on Saturday evening for an unspecified"national security meeting," AFP reported. (TASR)