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There are still unanswered questions abut the life and motivation of the Orlando nightclub shooter, as the investigation continues into his background and his whereabouts in the weeks leading up to the massacre that left 50 people dead, including the shooter, on Sunday.

FOX's Eben Brown reports from Orlando:

Omar Mateen's former co-workers at a security company, where he was stationed as a courthouse guard, say he had a short temper and made claims of relationships to Al-Qaeda, which prompted somebody to report him to the FBI, which concluded he was all talk.

While claiming allegiance to ISIS in a phone call to 911 in the midst of the attack, there are press reports now that Mateen was active on the dating app Grinder, often used by gay men, and had visited the LGBT friendly club frequently in the past.

In Orlando, Eben Brown, FOX News.

Follow FOX's Eben Brown on Twitter: @FOXEbenBrown