Updates from across the week
Members of the public have been reminded by police the security threat level nationally remains unchanged at "severe", meaning an attack is "highly likely".
The West Midlands force has asked residents to "remain alert and not alarmed".
It said concerns should be reported to a confidential anti-terrorist hotline on 0800 789 321.
Jennifer Harby
BBC News Online
West Midlands Police's statement on their action overnight suggested more than one location in Birmingham had been raided, external , but the force has refused to confirm a number.
Residents have told how more than a dozen black-clad police with machine guns smashed their way in to a second-floor flat in Hagley Road, Birmingham, at about 23:00 GMT on Wednesday.
Image source, PAStuart Bailey, who lives four doors down, was going for a drink with his friend when an armed officer shouted for him to "Go left".
The 25-year-old said: "There were a load of armed police in the street and on the pavement and I could see three or four in front of me.
"They were all dressed in black and armed with what looked like MP5s (submachine guns) and one of them had six ammunition magazines strapped to his leg.
"I wasn't allowed back in my property for an hour."
Another man who lives in a neighbouring flat said he was "scared and frightened" when he glanced out of the window and saw about a dozen armed police wearing Kevlar helmets and body armour in the street.
The man, who declined to be named, criticised the area saying it was "very unhygienic and at night there are rats - but it's cheap. People come and go all the time".
Lisa Wright
Journalist, BBC News Online
Birmingham City Council has made a public show of respect for those affected by the Westminster terror attack.
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Police have moved to reassure residents in the wake of last night's raid in Hagley Road, Birmingham, linked to the Westminster terror attack.
Officers made "intelligence-led" raids, the West Midlands force said, and "there was no immediate risk to public safety".
Extra officers will be out on patrol over the next few days, but the force stressed this was "not based on any new or emerging intelligence".
A raid on flats in Hagley Road, Birmingham, is linked to the terror attack in Westminster on Wednesday.
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Phil Mackie
Midlands correspondent, BBC News
We believe forensic investigations are continuing at the flat raided in Hagley Road, Birmingham.
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Footage has emerged of police taking part in a raid, external on a Birmingham house as they desperately tried to gain evidence about the man responsible for the devastating London attack.
Sima Kotecha
Midlands Correspondent, BBC News
There is more police activity at the flat raided in Hagley Road, Birmingham, taking place now.
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The Library of Birmingham was lit up red, white and blue last night in sympathy and solidarity with those affected by the Westminster terror attack.
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MPs from the West Midlands have told the Express & Star what they witnessed, external when a man broke broke through the gates of the Palace of Westminster and stabbed an officer.
A raid has been carried out on flats in Hagley Road, Birmingham, in response to yesterday's terror attack in Westminster, the BBC understands.
BBC Midlands correspondent Sima Kotecha reports from outside the raided flat in Birmingham.
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Sima Kotecha
Midlands Correspondent, BBC News
When we contacted West Midlands Police about the raid in Hagley Road, Birmingham, they told us it was to do with Scotland Yard.
What we can confirm is that there's a link between what happened here last night and what happened in Westminster yesterday.
We also know the car used in Westminster was hired in Solihull.
Charlie Slater
BBC Weather presenter
After a damp and cloudy start, any showers should clear with bright and sunny spells developing this afternoon and highs of 12C (54F).
You can find a detailed forecast for your area here .
Latest weather for the West Midlands
Daz Hale
BBC WM
This is the scene on Hagley Road this morning.
There is still a strong police presence near the door to the flat that was raided by armed police overnight.
We've still got officers standing guard around the premises.
The BBC understands the raid in Hagley Road, Birmingham, last night is linked to the Westminster attack.
Image source, PAPolice stormed a second-floor flat above a row of shops in Hagley Road at about 23:00 GMT on Wednesday.
After armed officers swooped on the address, non-uniformed police officers were spotted taking pieces of equipment into the property.
A witness told the Press Association: "They came and arrested three men."
Alex Homer
BBC Local Live
We'll be bringing you all the latest on the police raid in Birmingham overnight, which came in the wake of yesterday's Westminster terror attack.
You can email us as usual through the day, tweet us, external or visit our Facebook page, external .
A police officer earlier stood outside the address in Hagley Road where armed officers carried out a raid overnight.
Image source, PAMore on the raid in Birmingham last night.
Police stormed a second-floor flat above a row of shops in Hagley Road at about 23:00, witnesses said.
One witness told the Press Association: "They came and arrested three men."
