WASHINGTON — There is an active shooter at the U.S. Census Bureau headquarters in Prince George’s County and a security guard is wounded. Prince George’s County Fire Department Spokesman Mark Brady says first responders are treating an adult male — a guard — for a gun shot wound to the upper body at the headquarters located in the 4600 block of Silver Hill Road in Suitland, Maryland. The shooting occurred at 6:15 p.m. There is still at shooter at the campus, says Brady.

PGFD Firefighter/Medics on scene 4600 Silver Hill Road in Suitland Rd treating adult male with GSW to upper body. NFI NFD — Mark Brady (@PGFDPIO) April 9, 2015

Below is a tweet from the scene:

I’m standing at U.S. Census Bureau Headquarters. Police are all over the property. @nbcwashington is 1st on scene pic.twitter.com/yhnvd96Re4 — Shomari Stone (@shomaristone) April 9, 2015

There are still police cars rushing inside the Census Bureau gates. I count at least 15 cars now. pic.twitter.com/WEag7cTxH7 — Right Up Your Ali (@mstharrington) April 9, 2015

This story is developing. A WTOP reporter is headed to the scene.