This is NBC’s feed. It was Don Pardo that first broke the news.
https://www.youtube.com/watch?v=oJnoFA0u2Eg
I’ve watched a lot of these over the years- the initial CBS News report is just creepy...
There is a Dallas radio station report i heard once where the reporter is one the scene while its happening and you can here the police cars screaming by- its incredibly intense but i’ve never been able to find it again after hearing it once...