 We know now that the Secret Service, as they put it, neutralised the gunman. He was shot. One of our eyewitnesses saw him being shot. Now the whole place, and I'm still here, just 100 metres away from where it all happened, the whole place is in lockdown. There are security lights, lots of police. There have been choppers in the air. And the FBI is moving in to conduct an investigation into what is, after all, an attempted political assassination in America.