Yemen's Shiite rebels say two car bombs have exploded south of the capital Sana'a, hitting a school bus travelling near a rebel gathering and killing 10 fighters and at least 15 pupils.

The rebel group known as the Houthis blamed al Qaida for the attack in the Radaa area of Baydah province.

The group said the school bus was carrying female primary school children.

Local tribesmen said one of the cars targeted the home of a Shiite rebel leader, Abdullah Idris.

This is the second time Idris's house has been targeted since October.

The Houthis and al Qaida have been fighting in Radaa since the rebels overran the area in October.

The empowered Shiite rebels have made significant military advances in recent months, seizing control of the capital and other strategic cities.