UPDATE | Active shooter reported at Wright-Patterson base

DAYTON, Ohio (AP) — Federal and state authorities in armored vehicles and unmarked cars swarmed onto a sprawling Air Force base in Ohio today amid reports of an active shooter at a medical center.

Workers at Wright-Patterson were told to shelter in place on the sprawling base.

WHIO-TV reported an announcement was made at the medical center telling some people inside the building to leave with their hands on their heads.

The Bureau of Alcohol, Tobacco, Firearms and Explosives said via Twitter it was among several agencies responding to the active shooter reports.

Wright-Patterson sent a tweet saying it was responding to "a reported incident."

Stacey Geiger, with the base's public affairs office. said the base was on lockdown, but she had no other information to release.

Local police were directing traffic away from the base, which is Ohio's largest single-site employer with more than 27,000 civilian employees and military personnel.

The Ohio State Highway Patrol and local police also had officers at the base.

2:25 p.m.

DAYTON — There are reports of an active shooter at Wright-Patterson Air Force Base at the base hospital, according to an alert sent to base personnel.

"At approximately 12:40 p.m. today, base emergency responders, including security forces and fire department, responded to a reported incident in building 830, the Wright-Patt Hospital. There are no additional details at this time. Information will be released as it is available."

The Ohio State Patrol is closing Route 844 at North Fairfield Road, according to reports.

This is a developing story.