Police spokeswoman Joanna Lazar said nearly 4,000 people were evacuated from the shopping center and police spent five hours searching the facility for the reported bomb when the call came in around 5 p.m. Friday, Polskie Radio/Polish Press Agency reported Monday.
Lazar said police eventually determined the bomb threat was a hoax called in by a 25-year-old security guard.
"The man called with information about a bomb because -- so he says -- he wanted to leave work early due to personal reasons," Lazar said.
The man could face a possible eight years in prison if convicted of calling in the threat, Lazar said.
Ron Burgundy interviews Peyton Manning on SportsCenter
Gal Gadot cast as Wonder Woman for 'Batman vs. Superman'