Four people were killed and three others wounded on Sunday during clashes between Shiite Houthi militants and tribesmen in the eastern province of oil-rich Maarib, a tribal source has said.
The source, who requested anonymity, told The Anadolu Agency that tribesmen had attacked a Houthi checkpoint in the center of the eastern province.
Four people - three Houthi militants and a tribesman - were killed in the ensuing clashes, he added.
Three other people were wounded in the clashes, the source said.
Another source, meanwhile, said the attackers were affiliated with Al-Qaeda in Yemen.
The Houthi group, which seized Yemeni capital Sanaa in September of 2014, has not managed to control the oil-rich Maarib province so far.
However, some followers of the group set up checkpoints on roads leading up to the province every now and then.
The Houthis pitted themselves against Yemen's Sunni tribes and Al-Qaeda, which is said to be also powerful in Yemen, as they moved on to establish control in other provinces after capturing Sanaa.
Yemen has been in turmoil since a popular uprising in 2011 ended the autocracy of longstanding President Ali Abdullah Saleh a year later.
By Ali Oweida