Two days of fighting between Shiite rebels and gunmen from the powerful Hashid tribes in north Yemen have killed nearly 22 people, a tribal source said on Monday.

A presidential commission had on January 8 brokered a truce between the Huthi rebels and Hashid fighters, ending two days of clashes in Amran province.

The fighting first erupted when Huthis tried to seize the towns of Wadi Khaywan and Usaimat, both Hashid strongholds.