Houthi militants in Yemen used a mix of ballistic missiles, cruise missiles and drones to target Abu Dhabi and parts of Saudi Arabia on Monday, in one of the Iran-backed group’s most audacious attacks on its Gulf rivals in years, according to people briefed on the United Arab Emirates’ preliminary investigation.

The attack on Abu Dhabi’s airport and oil industry killed three people and injured six others, in the most visible demonstration of the military advances that the Houthis have made in recent years, allegedly with the help of Iran.

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