Reckless and fearless: Yemen's Houthis target U.S., Israel amid Hamas fighting

A series of escalating clashes between U.S. troops and Houthi rebel forces adds even more fuel to an already combustible powder keg in the Middle East, with analysts warning that the Iran-backed militant movement in Yemen is that most dangerous of adversaries -- an unpredictable force with little to lose and no particular stake in stability in one of the world's most dangerous regions.

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