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Sources familiar insist Travis was unaware of the severity of things.

@CherlyBonilla We're told Trav did, in fact, stop the show a few times to check on people who appeared to be unconscious or in distress, alerting security and other personnel over to them for assistance. But, our sources say he simply didn't realize how bad it actually was. Not just that, but we're told neither he nor his camp were even informed about deaths or hospitalizations until after the show was done. As we reported ... a total of 8 people have died thus far, and dozens more were injured and hospitalized, including several minors. Play video content THERE WAS AN INJECTION Fox 26 Houston As for Kylie... our sources say she too is quite upset, and is trying to console Travis as best she can by being there for him. Like we first told you, there were sightings of at least one person getting jabbed in the neck with a needle ... something Houston PD confirmed as accurate. It's unclear if that may have led to all of the cardiac arrests, or just one or a few -- but it'll certainly be looked at as part of the wider probe Travis -- who is cooperating with the authorities -- said Saturday he was heartbroken over everything, and sent his love out to the families of those who were affected. Read more