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Orlando shooter worked for global security firm

By Jackie Wattles and Joshua Gaynor

NEW YORK (CNNMoney) -- The man behind the worst mass shooting in U.S. history worked since 2007 as a security officer at one of the world's largest private security companies, which said Sunday it was "shocked and saddened" by the news.

"We are cooperating fully with all law enforcement authorities, including the FBI, as they conduct their investigation," G4S Secure Solutions said in a statement. "Our thoughts and prayers are with all of the friends, families and people affected by this unspeakable tragedy."

Omar Mateen, 29, murdered 50 people and injured 53 others at a gay club in Orlando, Florida, early Sunday morning.

G4S said Mateen started working for the company in September 2007. Florida state records show he was a licensed security officer.

Based in Jupiter, Florida, G4S says it has operations in more than 100 companies. It provides security guards, technology and other services. Its customers span a range of industries including mining, finance and retail.

Mateen, who was shot and killed by police, claimed allegiance to ISIS in a phone call to authorities around the time he carried out the "organized and well-prepared" attack, Orlando Police Chief John Mina said.

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