Trump: Armed officer was 'coward' or 'didn't react properly under pressure' during shooting

The Florida high school where a former student shot and killed 17 people has reopened for teachers as the community deals with claims that the armed officer on campus did nothing to stop the shooter.

There were also reports of a delay in security camera footage scanned by responding police, as well as several records indicating the 19-year-old suspect displayed behavioural difficulties for years - adding to what the Florida house speaker Richard Corcoran described as an "abject breakdown at all levels".