gas attack

White House: Even Hitler didn't gas people

White House: Even Hitler didn't...

Press secretary gets his history wrong at briefing.

US prepares for assault on Assad

US prepares for assault on Assad

Trump says 'something should happen' on Assad

Trump warns Assad over attack

Trump warns Assad over attack

Trump says Syria gas attack 'horrific'

London Airport evacuated in possible CS gas attack

London Airport evacuated in possible CS gas attack

London City Airport evacuation 'may have been caused by CS gas'