Radio communication to the full team did happen. At least before he had his gun out and was just walking around acting suspicious. And they tried to find him, but could not. I think once he took his gun out, it went relatively quickly. I don't he had his gun out until like the last 10 minutes. Speculation but the first witness we know who saw him with a gun said he was already crawling on the roof. And Trump had been speaking for a few minutes. So now we have a full blown threat and a ticking clock

https://www.bbc.com/news/articles/cn4v7v2g5l1o It seems they noticed him with a gun before any police and they were not close to the police.

We're pointing at him, the police are down there running around on the ground, we're like 'Hey man, there's a guy on the roof with a rifle'... and the police did not know what was going on.

I think they were just shouting and pointing. Because it was not instant communication.

Mr Smith said he tried to alert the authorities for three to four minutes, but thought they probably could not see the gunman because of the slope of the roof.

So a local cop was alerted, tried to climb on the roof, they gunman drew on him and he let go of the ledge, it was seconds later he opened fire.

It would interesting to know how all that communication went down, but all this cascade of issues and breakdowns stem from, that roof wasn't secured or in full site of the sniper set up.

That did happen. At least before he had his gun out and was acting suspicious. And they tried to find him, but could not. I think once he took his gun out, it went relatively quickly. The first witness we know who saw him with a gun said he was already crawling on the roof. And Trump had been speaking for a few minutes. So now we have a full blown threat and a ticking clock

https://www.bbc.com/news/articles/cn4v7v2g5l1o It seems they noticed him with a gun before any police and they were not close to the police.

We're pointing at him, the police are down there running around on the ground, we're like 'Hey man, there's a guy on the roof with a rifle'... and the police did not know what was going on.

I think they were just shouting and pointing. Because it was not instant communication.

Mr Smith said he tried to alert the authorities for three to four minutes, but thought they probably could not see the gunman because of the slope of the roof.

So a local cop was alerted, tried to climb on the roof, they gunman drew on him and he let go of the ledge, it was seconds later he opened fire.

It would interesting to know how all that communication went down, but all this cascade of issues and breakdowns stem from, that roof wasn't secured or in full site of the sniper set up.