One car bomb hit Houthi militants ; another exploded next to a military bus , officials say . Al Qaeda has since intensified its attacks on Houthi targets , conducting daily attacks killing hundreds of Houthis and innocent civilians . Both bombs , apparently from al Qaeda fighters , were intended for Houthi militants , officials say . Houthis , al Qaeda have been fighting in Yemen for years .
One car bomb hit Houthi militants ; another exploded next to a military bus , officials say . Both bombs , apparently from al Qaeda fighters , were intended for Houthi militants , officials say . Houthis , al Qaeda have been fighting in Yemen for years .