The press secretary of a House Republican was arrested Friday morning for carrying a firearm into a House office building.

Ryan Shucard, press secretary for Rep. Tom Marino (R-Pa.), was arrested at approximately 9:15 a.m. after officers found a 9mm Smith & Wesson handgun and magazine with Shucard as he went through security to enter the building. Shucard is being held at Capitol Police headquarters on Capitol Hill, according to Capitol Police spokeswoman Lt. Kimberly Schneider.

It was not immediately clear whether the weapon was found on Shucard's body, in a bag, or elsewhere.

Shucard has been placed on unpaid administrative leave indefinitely, according to Marino's chief of staff, Bill Tighe. The office is cooperating with law enforcement, and Tighe said his office had been told by Capitol Police that Shucard appears to have accidentally brought the weapon with him to work and had no malicious intent.

All people entering congressional office buildings and the U.S. Capitol must pass through metal detectors, but lawmakers are usually given permission to go through without screening.

Marino has represented Pennsylvania's 10th Congressional District since 2011. The district stretches from neighborhoods north of Scranton, toward Williamsport, Pa., and south to areas north of Harrisburg.