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SAN'A, Yemen - Saudi warplanes and artillery bombarded a Shiite rebel stronghold in northern Yemen Saturday for a third straight day, according to the rebel fighters, and Yemen's president vowed to wipe out the insurrection.

The sporadic five-year conflict between Yemen's weak central government and rebels in the north of the impoverished country escalated dramatically this week when Saudi military forces began shelling and bombing rebel positions.

The two nations are cooperating and sharing intelligence in the fight. Officials in neighboring Saudi Arabia have been increasingly worried that extremism and instability in Yemen could spill over to their country, the world's largest oil exporter.