Also useful background:

Yemen: Defusing the Saada Time Bomb

International Crisis Group, Middle East Report N°86 , 27 May 2009

Away from media headlines, a war has been raging on and off in Yemen’s northern governorate of Saada since 2004, flaring up in adjacent regions and, in 2008, reaching the outskirts of the capital, Sanaa. The conflict, which has brought about extensive destruction, pits a rebel group, known generically as the Huthis, against government forces. Today’s truce is fragile and risks being short-lived. A breakdown would threaten Yemen’s stability, already under severe duress due to the global economic meltdown, depleting national resources, renewed tensions between the country’s northern elites and populations in the south and the threat from violent groups with varied links to al-Qaeda. Nor would the impact necessarily be contained within national borders. The country should use its traditional instruments – social and religious tolerance, cooptation of adversaries – to forge a more inclusive compact that reduces sectarian stigmatisation and absorbs the Huthis. International actors – principally Gulf states and the West – should use their leverage and the promise of reconstruction assistance to press both government and rebels to compromise.

After two decades of relative stability that confounded foreign diplomats and analysts alike, the convergence of economic, political and secessionist challenges are testing the regime’s coping capacity. The Saada conflict might not be the most covered internationally, but it carries grave risks for Yemen’s political, sectarian and social equilibrium.
Executive summary and link to full report here (registration required for the full report).