in pittsburgh in the swirl hill neighborhood of pittsburgh, a well known historic jewish neighborhood. the service started at 9:45. it is saturday shabbat, according to the website, the busiest day in any synagogue. 9:45 is when the service evidently started. 10:20, just after that, when reports of active shooter came to cnn here. we did speak to sheriff s deputy kevin krause. he said it is an active, fluent situation and i can t talk now, but we have a little more information from the pittsburgh public safety, verified twitter account, confirming active shooter. they say it is near the synagogue. there are other unconfirmed reports we re working to pin down. still a fluid situation as you look at images from kdka in pittsburgh. fredricka? nick, when you say active shooter situation, what do we know may have preceded to get that label. were there shots fired? was it the sight of an alleged