article_snippet.sent: The latest action heats up an already intense conflict that could have ramifications across the Middle East.
article_snippet.sent: Houthis are battle-hardened guerrilla fighters and could cross into Saudi Arabia.
article_snippet.sent: Houthis've already threatened suicide bomb attacks inside Saudi Arabia.
article_snippet.sent: Yemen, already the home base to al Qaeda in the Arabian Peninsula, teeters on the brink of becoming a failed state and an even more fertile breeding ground for extremism.
article_snippet.sent: The Sunni Saudis are Shiite Muslims who have taken over Sanaa and had captured parts of Sanaa second-largest city, Aden.
article_snippet.sent: The Sunni Saudis consider the Houthis proxies for the Shiite government of Iran and fear another Shiite-dominated state in Yemen.