A mass shooting threat leads to a stash of weapons at a home in Maryland.

FOX News Radio's Rich Johnson has details from Washington:

Police say it started earlier this week when a man who was about to be fired from his job made threatening calls to that business, calling himself  'A Joker'.

Prince George's County Deputy Chief Henry Stawinski says that concern increased when police from another county talked to the man.

(Stawinski) "During a field interview with their officers, the individual was wearing a t-shirt that said 'Guns don't kill people, I do'."

Authorities got an emergency order to hold the man for a mental evaluation, then found thousand rounds of ammunition and at least two firearms in his house.

In Washington, Rich Johnson, FOX News Radio.