It is legal in Nebraska to possess a stun gun or Taser for self-defense, though misuse of one could result in criminal charges.

As the investigation began Tuesday afternoon, police said they aren’t sure what, if anything, led the man to begin to harass other customers inside the Chick-fil-A.

Bliemeister said “there has been absolutely no information reported to us” about the man “espousing any type of extremist beliefs.” Nothing tied the man to the restaurant other than him being a customer, the chief added.

Officers were serving a search warrant at the man’s Lincoln apartment later Tuesday, and have recovered the man’s weapon, although they did not say what kind of weapon it was. Investigators were also reviewing surveillance videos, as well as photos and videos taken inside the restaurant by witnesses.

The man was known to police, Bliemeister said, but did not have an arrest record.

The pickup lodged in Chick-fil-A was registered to a man who listed his address as Stone Ridge Estates, a gated, upscale apartment complex near 27th Street and Yankee Hill Road.

Just after 5 p.m. Tuesday, a single officer was standing next to his cruiser outside the man's apartment, but there was no other activity.