The nature of the threat is not yet known. Developing…
From the BBC:
Police in Birmingham in the Midlands are evacuating the city centre.
Earlier they issued a warning they had received intelligence suggesting a threat to the area.
“Our response needs to be proportionate in the action we’re taking and in informing the public,” a spokeswoman for West Midlands Police said.
Police are now closing down the Birmingham Broad street entertainment zone and asking people to go home.
Also here:
West Midlands Police announced they had received intelligence of a possible threat to the area around 2015BST.
Initially people were told to be on their guard and that bars and restaurants were being searched. Motorists were also told not to come into the city centre.
Around 2100BST the police announced that the city was to be evacuated.
Jeff Quinton is rounding up links and info here. See also, Command Post.

Fox is reporting that British authorities did a couple of controlled detonations on some suspicious packages.
Are you sure you don’t mean Birmingham, AL? Of course, there the threat is very well known, and is named Dennis.
The hurricane, I mean. I’m pretty sure Dennis Raimondo doesn’t leave San Francisco.
The story isn’t on Fox website yet, only on FNC.
Yeah, I flipped to FNC, they ran something on the scroll. Didn’t say anything about 30k evacuated, didn’t sound that serious, really.
I heard about the 30K evacuated on FOXNews about an hour ago, Matt. Haven’t heard much since, though—except for the bit Daniel brings up about a controlled detonation.
That’s Justin, you Raimondophobic bastard!!
This blog is a hotbed of Raimondophobic bigotry.
West Midlands Police releaste (on my post) says they exploded 4 suspicious packages on a bus near a pub and they were false alarms but they were also checking on another suspicious package.
Local police chief saying nothing to do with London. Last update on the police news site was a quarter past midnight over there.
Weird. This is barely on the news feed anywhere.
Nice to see the media doing a great job of protecting us from needless fearmongering.
The Smiths seem oddly prescient.
WHAT DID MORRISSEY KNOW AND WHEN DID HE KNOW IT?