MIDTOWN MANHATTAN, NY — A shooting scare Friday night at Penn Station turned out to be a false alarm, according to the NYPD — but not before causing "mass hysteria" and a "stampede" inside the station and on surrounding city blocks, all the way up to the Macy's in Herald Square, according to witnesses. (For updates on the situation at Penn and other local news delivered straight to your inbox, sign up for Patch's daily newsletters and breaking news alerts in your NYC neighborhood.)

The multiple "shots fired" calls reported at #PennStation are UNFOUNDED at this time.@NYPDMTS

— NYPDCounterterrorism (@NYPDCT) April 14, 2017 Following earlier unfounded incident at Penn Station, expect traffic delays/emergency personnel/possible transit disruptions in the area.

— NYCEM - Notify NYC (@NotifyNYC) April 14, 2017 Things were already tense inside Penn Station leading up to the scare — thanks to a massive power outage that caused widespread delays across the NJ Transit, Amtrak and Long Island Rail Road systems on the eve of the Easter holiday weekend.

So when rumors started rippling through the crowd of commuters that a shooter may be loose in the station around 6:30 p.m., the scene erupted into total mayhem.

Witness footage showed people panicking and running through the halls of Penn, spilling their food and drinks left and right and leaving suitcases, clothing and other personal belongings strewn behind — causing others to trip and fall during the stampede. At least 13 people were injured "when self-evacuating from Penn Station" Friday night, the FDNY said.

The panic at Penn Station this evening as a tasering by the MTA was mistaken for gun shots, and mass hysteria took over. pic.twitter.com/FSSeTLlbmc

— NYCFireWire (@NYCFireWire) April 14, 2017 Caos en #PennStation, #NYC tras uso de Taser por policía #Amtrak @ABC7NY pic.twitter.com/TcPUWZ8CYd

— InfoEmergencias (@InfoEmerg) April 14, 2017 "Chaos at Penn Station," a guy named Brady Hamed wrote on Twitter. "Someone said they saw a gun and everyone stampeded out. I hid in a Hudson Books!"

"Mass hysteria near 34th Penn," wrote another Twitter user named Aaron Glass. "Cops are saying nothing happened. Police everywhere. Something isn't right, people are crying..."

According to PIX11 and ABC7, though, people inside Penn freaked out after Amtrak police Tased a man for "disobeying orders." Some may have mistaken the sound of the Taser for the sound of a gun, reports said.

Here's a video showing Amtrak police sitting on the guy they Tased: Mass panic erupted at Penn Station this evening when police chased and tased a man inside the Amtrak waiting area pic.twitter.com/iqMpN4xseY

— AJ Ross (@AJRossABC7) April 14, 2017 Amtrak did not return multiple calls for information on what happened.