Assessing competing explanations

Pressure is mounting on the Trump administration after a video appears to show a US Tomahawk missile was used in a deadly strike on a girls' school in Iran. 

The New York Times is reporting an ongoing military investigation has determined that the US is responsible for the strike, citing US officials and others familiar with the preliminary findings.

The investigative outlet Bellingcat was the first to geo-locate the footage.

• GUEST: Eliot Higgins, founder of Bellingcat