Ashya S. McKay, 22, is in the Butler County Prison on $25,000 bail. She faces felony assault and other charges.
McKay is accused of showing up at the postal center's parking lot at Pennwood Place about 6:30 a.m. June 4 waving a handgun in the air, Cranberry Township Police said.
The defendant at some time had worked at the postal service's bulk mail center in nearby Warrendale.
She confronted two employees at one of the doors at the Cranberry facility and pointed the gun at them, according to court documents.
One of the workers asked the suspect what she was doing.
“What the (expletive) you think I'm doing,” the defendant replied, a police affidavit said.
McKay walked back to her vehicle when the employees told her that police had been called.
“Upon reaching her vehicle,” the affidavit said, “(she) climbed onto the roof of the vehicle and began to jump up and down and point the handgun at drivers and employees who were entering the south gate leading to the docks.”
Moments later, police said, the defendant drove away.
No one was injured.
Police identified McKay, in part, from the license plate number on her car. The employees confirmed her identification after officers showed them her driver's license photo.
District Judge Sue Hagggerty late Monday night arraigned McKay on a felony charge of aggravated assault and misdemeanor charges of terroristic threats and reckless endangerment.
A preliminary hearing for McKay, who is unemployed, is set for Friday before District Judge Dave Kovach.