The alarm caused about 150 to 200 passengers in the terminal to \"self-evacuate\" outside Gate 37, the Port Authority said.

\"I ran with the crowds, hid under some seats, looked for an exit, headed out to the tarmac,\" tweeted Erin Fors, one of those who ended up on the tarmac. \"Sounded like gun shots but after seeing the damage in this terminal, it’s more likely it was glass being shattered from people jumping. Terrifying.\"

Video showed passengers returning to the terminal once calm had prevailed with bags strewn everywhere.

The two men who fled the airline employee were being interviewed and there were no charges or arrests, authorities said.

Shooting scare at Newark Airport. Police arrived in seconds. We are all outside on the runway. Terrified . pic.twitter.com/WLDLKb4mKV

— Cristina Centeno (@Coach_Centeno) September 3, 2019

Passengers had to be rescreened once they were allowed back inside.

The Port Authority said there was no impact to airport operations. An investigation is underway.

ABC News' Welington Gomez-Munoz and Will Gretsky contributed to this report.

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