A strong explosion late Sunday rocked a government administration complex held by Zaidi Shiite rebels in northern Yemen, witnesses said.
The blast happened while leaders of the Shiite rebellion were meeting in the complex at Al-Matamma, a city in Al-Jawf province, northeast of the Sanna, they said.
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The complex was in flames and the explosions were heard in several neighbouring villages, witnesses and tribal sources added.
The blast came two days after the signing of a truce by the Shiite rebels and the Islamist Al-Islah party, in a bid to stop the fighting that since March has flared intermittently in the area near the border with Saudi Arabia.
Tribal sources, contacted by AFP from Sanaa, indicated it was a car bomb that claimed several victims without giving a precise number.
Yemen's mountainous northern region is a stronghold of the Zaidis, also known as Huthis, who from 2004 fought six wars with central government forces before signing a truce in February 2010.