Yemen's president and PM 'resign'

Yemen's President Abdrabbuh Mansour Hadi and his Prime Minister, Khaled Baha, have resigned, officials said.

It comes amid an ongoing stand-off with Shia Houthi rebels.

Houthi gunmen have a tight grip on the capital, Sanaa, and are holding a presidential aide who was abducted last week.

There are reports that Yemen's parliament has refused to accept the president's resignation.

The Houthi leadership had previously committed to withdrawing from key positions around the presidential palace and the home of President Hadi.