Update 6:45 p.m.:

So it's kind of a funny story...

A family discovered the grenade in a box of old clothes, which they had picked up earlier today from a household being evicted.

They weren't sure what the device was until they looked it up on the Internet, said deputy fire chief Fred Knapp, because the experimental, WW2-era "Beano" grenade (pictured) looks more like a baseball than the traditional bomb-in-a-pineapple.

But a grenade it was, and when a woman plopped the Beano down on the station's front counter about 4:15 p.m., an officer promptly evacuated the building.

Everyone was allowed back in by 6 p.m., Knapp said, after a bomb squad removed the grenade. They'll now X-ray it to see if it's live and destroy it at a bomb range if necessary.

Weird? Only a little.

"We've have a lot of World War 2 vets in Haltom City over the years and this type of thing is really not uncommon," Knapp told me. "The difference is they brought it into the police station this time."

Don't do that, by the way. If you happen across an explosive while cleaning out granddad's garage or something, Knapp suggests you leave it alone and call 911. They can be unstable.

Speaking of which, Wikipedia has this to say about

the ill-fated T13 Beano:

Yikes.

Update 6 p.m.:

WFAA tweeting

it's all clear now.

Original report 5:40 p.m.:

So say

WFAA

and

NBC-5.

When I call police to confirm, no one picks up, which would make sense.

NBC's got a few more details, and makes the grenade sound less malicious than misguided: