Unidentified assailants fired a missile at the home of key Yemeni tribal chief Sheikh Sadiq al-Ahmar, a leading opposition supporter, on Tuesday causing casualties, a tribal source said.

"The home of Sheikh Sadiq was hit by a missile and there were several dead or wounded," the source said.

"Among the wounded was General Ghaleb Gamash, who was leading a mediation mission," the source added.

Earlier a source close to the tribal leader told AFP that an armoured vehicle had opened fire killing five people outside his home.

The same source said at least 90 others were hurt while a security official said one policeman died and four others were wounded in the encounter.

Sheikh al-Ahmar, who heads the Hashid tribal confederation, the largest in Yemen and a former crucial source of support for President Ali Abdullah Saleh, pledged his support for the opposition in March.

He accused Saleh, who is facing mounting pressure to quit office after 33 years, of trying to spark a "civil war" in an attempt to remain in power.

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