A bomb wounded six Shiite militiamen in the Yemeni capital on Monday, a security official said, the latest in spate of attacks on the Huthi fighters who overran Sanaa in September.
The blast hit a post of the Huthis' police force in the Hayel district of Sanaa, the official said.
It came a day after a bombing claimed by Al-Qaeda killed four people, including a journalist, at a Huthi gathering in the mainly Shiite city of Dhamar, south of the capital.
On Thursday, a suicide bomber killed 49 people at a religious celebration organised by Huthi supporters in the militia-held but mainly Sunni city of Ibb further south.
The Huthis have met mounting resistance from armed Sunnis, including Al-Qaeda loyalists, since they swept south from the capital into Sunni-majority areas late last year.
Yemen has been dogged by instability since an uprising forced longtime strongman Ali Abdullah Saleh from power in 2012, with the Huthis and Al-Qaeda seeking to fill the power vacuum.