Missed Warning Weeks Before Orlando Shooting?

Gun shop owner says his salespeople refused to let Omar Mateen buy body armor, ammo.
1:12 | 06/16/16

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Transcript for Missed Warning Weeks Before Orlando Shooting?
We are learning new details about a missed warning sign. A gun shop owner reported him weeks before the attack. ABC's chief investigative correspondent Brian Ross is here and, Brian, we always hear the phrase if you see something, say something. A lot of people said something. That seems to be the case. The owner of the gun shop in Jensen beach, Florida, told ABC news Mateen tried to buy body armor and bulk ammunition from his store but he turned him down because he seemed suspicious. The owner says he then notified authorities about his suspicions of Mateen. That was almost three weeks before the shooting, Amy. No immediate comment so far from the FBI or local authorities. Certainly we expect to hear one soon. In the meantime, there are reports of new Isis threats against tourists in Europe as well as gay nightclubs everywhere. That's right. Authorities in Europe are sorting through reports that new teams of Isis fighters have been dispatched from Syria to Europe. This comes at a time of high anxiety because of the ongoing soccer championships being played out in France so far, though, the only problem some raucous violent fans. Summer travel season. There is a travel warning out for U.S. Tourists going to Europe. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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