Editor's note: Updated 4:25 p.m. ET
(Bloomberg) -- G4S Plc’s approach to the vetting of its security personnel is under scrutiny after it emerged that Florida nightclub killer Omar Mateen had been employed by the world’s biggest guarding company for almost a decade.
Mateen, who declared his allegiance to terror group Islamic State in the hours before the largest mass shooting in U.S. history, had been working at a gated retirement community prior to the deaths in Orlando, G4S confirmed Monday, sending its stock tumbling to the lowest intraday price since March 2009.
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