At the start of my New Media Tools for Journalism class at BU today, I brought up twitter search, because I heard about a shooting in Delhi.The first tweet I saw was from Andy Carvin:Reports are saying that six gunmen were shot at Delhi's airport. Any reports of civilian casualties? Haven't seen anything on the wires yet. Anyone on Twitter at Delhi's airport right now? Sounds like there was just an attack there.Then I went to twitter search for Delhi to find the first actual tweet about it.Six gunmen have been shot dead by Indian security forces at Delhi's main international airport, airport offici.. http://tinyurl.com/5kve89LinkThat account has an image of BBC NEWS but the link goes to http://menti.net/Following that link you find that this account is owned by Mario Menti and posts BBC NEWS ALERTS.Here's an explanation:Due to popular demand, I have added a twitter bot that will only post the BBC breaking news alerts, not the regular news items. This is going to be useful for people who don’t want to put up with the relatively frequent posts from the BBC news feeds.That tweet lead to a flurry of re-tweets. Some with attribution, some without.As we watched the stream of tweets, the news changed.The initial news story linked to in the first tweet, now reads like this: