8:33 p.m.: Montgomery County Police spokesperson Capt. Paul Starks has confirmed to ABC7 that the man made the threat in regard to the care of his mother in the hospital.
Authorities will investigate the threat's credibility and the man's mental stability.
8:24 p.m.: The man who called in a threat to a hospital in Rockville is now in the custody of Fairfax County Police.
7:50 p.m.: A man has called in a threat to Shady Grove Adventist Hospital in Rockville, police say.
Montgomery County Police are on the scene and waiting for him if he shows up.
The hospital is not on lockdown at this time.
Watch WJLA.com and ABC7 for updates.