The international medical organisation Médecins Sans Frontières has criticised an overnight bombing in Yemen.

The Saudi-led coalition blasted the entire Sa'ada Province with 47 tomahawk cruise missiles.

However MSF is warning that 'the bombing of civilian targets, with or without warning, is a serious violation of international humanitarian law.'

It also says there's a risk of an exodus of thousands of people towards the mountains, where humanitarian aid won't reach them in time.

Médecins Sans Frontières is calling on the coalition to avoid attacking civilian targets, especially hospitals and water distribution systems.