Security officials say fighting is raging on in Yemen, with airstrikes by the Saudi-led coalition hitting rebel targets in multiple cities, including the capital, while street battles in the city of Taiz have killed several civilians including four from the same family.

They say the clashes in Taiz between rebels and forces loyal to the exiled president saw errant artillery rounds repeatedly hitting residential areas, killing at least eight civilians. They added that air raids over the past day have struck over 30 military bases.

Resident Fahmy Abdul Qader said his cousin's wife and three of her children were killed by shelling that hit the family home overnight in Taiz.

The officials spoke on condition of anonymity because they weren't authorized to brief journalists.