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Theresa May has expressed her sympathies to the victims of the "evil and cowardly" Westminster terror attack carried out by Khalid Masood.
The Prime Minister added her handwritten card to piles of tributes outside Parliament.
It said: "With deepest condolences for those who lost their lives as a result of this evil and cowardly attack. Our thoughts and prayers are with them and their families."
Counter-terrorism police have been searching a home in Birmingham over the weekend where friends of Westminster attacker Khalid Masood lived.
Officers were seen by neighbours on Saturday at the maisonette in Bredon Croft, Hockley, less than 200 yards from a property Masood had lived in until the end of 2016.
Specialist police search teams were still at Bredon Croft home on Sunday removing bags of evidence.
Meanwhile, a 58-year-old arrested in Birmingham remains in custody.
The hunt for the 52-year-old Masood's accomplices saw 11 people held after raids across the country.
Latest ITV News reports
Kurt Cochran and his wife Melissa had been visiting London from the US to celebrate their 25th wedding anniversary and were due to fly home.
A 30-year-old man was arrested in Birmingham on Sunday on suspicion of preparing terrorist acts.