The man identified as the Orlando gay club shooting gunman worked for G4S

Shares in G4S cratered in early Monday morning trading after it was confirmed that the man identified as the shooter in the attack on a gay nightclub in Orlando that killed at least 50 people was once employed as an armed security officer by the company.

Shares fell sharply at the open, and have continued to slip since. Here’s how that looks:

The shooting was the deadliest in US history. The suspected gunman, 29-year-old Omar Saddiqui Mateen, reportedlypledged allegiance to ISIS (also known as the Islamic State, ISIL, or Daesh) in a 911 call.

And here is the full statement from John Kenning, Regional CEO at G4S North America & Technologyin response to the shootings:

We are deeply shocked by this tragic event. We can confirm that Omar Mateen had been employed by G4S since Sept. 10, 2007. Mateen was off-duty at the time of the incident. He was employed at a gated retirement community in South Florida.

Mateen underwent company screening and background checks when he was recruited in 2007 and the check revealed nothing of concern. His screening was repeated in 2013 with no findings.

We are cooperating fully with all law enforcement authorities, including the FBI, as they conduct their investigations. In 2013, we learned that Mateen had been questioned by the FBI but that the inquiries were subsequently closed. We were not made aware of any alleged connections between Mateen and terrorist activities, and were unaware of any further FBI investigations.

Our thoughts and prayers remain with the victims of this unspeakable tragedy, and their friends and families.

NOW WATCH: Hugh Hefner’s son reacts to the sale of the Playboy Mansion

NOW WATCH: Money & Markets videos

Want to read a more in-depth view on the trends influencing Australian business and the global economy? BI / Research is designed to help executives and industry leaders understand the major challenges and opportunities for industry, technology, strategy and the economy in the future. Sign up for free at research.businessinsider.com.au.