WITTENBERG, Wis. (AP) -

Police have arrested a gunman who held a McDonald's restaurant worker hostage and caused a standoff in Wittenberg.

Shawano County Sheriff Randall Wright says the 28-year-old suspect from Gillett held the worker captive for about an hour Tuesday before letting him go unharmed. The suspect surrendered about an hour later without incident.

Authorities were called around 2 p.m. to a Shell convenience store that includes a McDonald's. The sheriff says the suspect let everyone in the store leave expect for one worker.

Authorities don't know what caused the incident. They say the suspect did not demand money and is not related to the hostage.

WAOW-TV reports nearby schools went into lockdown as a precaution.

U.S. Highway 45 was shut down for about two hours during the standoff. No one was hurt.