A US Presidential candidate appears to be unaware of the Syrian city Aleppo or the situation there.

Gary Johnson is running as a Libertarian candidate against Hillary Clinton and Donald Trump.

He was questioned about a major flashpoint of the Syrian war and appeared not to have heard of the city.

Aleppo has been under seige for months and supplies of food and medicine hasv been described as dangerously low.

This was the moment he was asked on US TV about the situation in Syria: