One of the hostages had a prior relationship with the suspect, the prosecutor said.
A person answering the phone at the township police department says it is an active shooter situation, but didn't give further details.
Law enforcement officials have not yet commented on whether anyone has been injured by the shooter, whether shots have been fired, or given any indication as to his identity.
"He walked through the main entrance and he grabbed his girlfriend and started punching her", said truck driver and witness Ashram Hajomar. The suspect, later identified as William Owens, 39, of Sicklerville, New Jersey, was pronounced dead at the scene, the New Jersey Attorney General's Office said Monday afternoon.
Law enforcement agencies responded to the scene and attempted to coax the man outside.
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Sometime during the flight, the passenger disclosed he was carrying the firearm, and the airline immediately informed the TSA. The was no word whether that includes the passenger being arrested.
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CBS Philadelphia reports that schools in the Logan Township School district have been placed on modified lockdown, meaning classes are going on as normal but nobody is allowed in or out of schools.
Shortly before noon, as the prosecutor's office was updating reporters on the situation, a short burst of gunfire was heard from the area of the facility.
Police officers could be seen ducking behind police vehicles outside a loading ramp.
The suspect held 2 employees hostage for hours before police fatally shot him.
Thomas said she didn't even know Owens owned a gun. Dowling says he then heard what he thought was a gunshot and began to run along with other employees. "Apparently he was shot", said Fiore. Mayor Frank Minor said Logan Township has some 6,500 residents, with about 18,000 people in the area each workday.