From BBC News:

Fighting has broken out between the Houthi rebels and those loyal to ex-president Ali Abdullah Saleh in the capital Sana’a.

Mr Saleh’s General People’s Congress (GPC) party said four people were killed in fighting at the main mosque in the capital, Sanaa, on Wednesday.

It accused the Houthis of undermining their partnership.

The once bitter enemies are fighting a war against forces loyal to the current President, Abdrabbuh Mansour Hadi.

Wednesday night’s clashes in Sanaa took place around the Saleh Mosque, which is Yemen’s largest and is named after the country’s former authoritarian leader.

The GPC said Houthi fighters had tried to occupy part of the complex ahead of a rally nearby on Thursday to celebrate the Prophet Muhammad’s birthday.

The fighters “broke into the Saleh Mosque, fired RPGs and grenades inside the mosque and put its regular guards under siege”, it alleged.

The rebel-run Saba news agency cited a source at the Houthi-controlled interior ministry as saying its security personnel had sought access to the mosque to ensure the safety of those attending Thursday’s rally.

After they were refused entry, the security personnel came under fire from “armed elements” inside without warning, forcing them to respond, the source added.

The source said a number of security personnel were wounded, but medical officials at two hospitals told AFP news agency that nine Houthi fighters were killed.

On Saturday, Houthi leader Abdul Malik al-Houthi appeared to accuse Mr Saleh’s supporters of failing to “understand the concept of alliance and partnership”. It came after the GPC referred to Houthi fighters as “cartoonish mercenary things”.