Journalists' killer said he was 'a human powder keg'

A man who shot dead a TV reporter and cameraman during a live news broadcast in the US told authorities afterwards he was a “human powder keg...just waiting to go boom!”

In a rambling letter sent to ABC News after former colleagues were gunned down at a shopping centre in Moneta, central Virginia, Vester Lee Flanagan cited a long list of grievances, dating back to the 2007 mass shooting at Virginia Tech and the more recent massacre of worshippers at a historic black church in Charleston, South Carolina.