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.

A look at the warships, jet fighters and missiles massing at Iran’s doorstep.

Washington has increased its military presence in the Middle East and is preparing contingency plans for possible action against Tehran, which has warned for a regional war in case of an attack from the US or its allies.

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.

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

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

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