Trump has moved key warships and hundreds of fighter jets into the Gulf region as fears rise the US could launch strikes on Iran.

Dozens of fighter jets, including F-35s, F-22s, F-15s and F-16s, left bases in the U.S. and Europe and were spotted heading to the Middle East by the Military Air Tracking Alliance, a team of about 30 open-source analysts that routinely analyzes military and government flight activity.

As the United States continues a significant military buildup in the Middle East, Iran has taken steps to signal its readiness for war, including fortifying its nuclear sites and rebuilding missile production facilities.

A second American aircraft carrier -- the USS Gerald R. Ford -- is heading toward the Middle East amid rising tensions with Iran, accompanied by destroyers and aircraft being redeployed from missions in the Caribbean region, a U.S. official told ABC News.

US President Trump gives Iran 10-15 days for a nuclear deal or face “bad things”, as second aircraft carrier nears region, Iran holds Russia drills, and both sides prepare for potential conflict. Full

Trump expressed optimism last week that a nuclear deal could be made with Iran, but said he was prepared for the alternative.

Ayatollah issues warning as nuclear talks under way – but president says Tehran will never abandon its enriched uranium programme

An armada of American warships, stealth fighters and air defense systems is taking up positions in the Middle East.

The talks come as the U.S. ramps up its military presence in the Middle East and Iran holds large-scale maritime exercises.