Dust rises from the site of a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015. (Reuters)

Dust rises from the site of a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015. (Reuters)

People sit at a house destroyed by a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015 (Reuters)

People gather at the site of Saudi-led air strikes in Yemen's capital Sanaa September 17, 2015 (Reuters)

A man stands at the site of Saudi-led air strikes that destroyed several houses in Yemen's capital Sanaa September 17, 2015 (Reuters)

People gather at the site of Saudi-led air strikes in Yemen's capital Sanaa September 17, 2015 (Reuters)

A poster is seen on the wall of a room of a house detroyed by a Saudi-led air strike in Sanaa, Yemen, September 17, 2015 (Reuters)

People gather at a house detroyed by a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015 (Reuters)

Houses destroyed by Saudi-led air strikes are pictured through the wall of a nearby damaged house in Yemen's capital Sanaa September 17, 2015. (Reuters)

A worker walks at a chocolate factory destroyed by a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015 (Reuters)

Mahyoub al-Hemiari talks on the phone inside his house which is detroyed by a Saudi-led air strike in Yemen's capital Sanaa,September 17, 2015 (Reuters)

Smoke rises from a chocolate factory destroyed by a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015. (Reuters)

People gather at the site of a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015 (Reuters)

People gather at the site of a Saudi-led air strike in Yemen's capital Sanaa September 17, 2015 (Reuters)