Two people arrested in connection with the attack in Westminster have been released and will not face further action, leaving just one of the 11 originally detained by police in the aftermath of the incident in custody.
The Metropolitan police said on Saturday that one man, a 58-year-old arrested in Birmingham the morning after the attack, was still being held while further enquiries were being carried out.
A 27-year-old man, also arrested in Birmingham, was released from custody with no further action and a 39-year-old woman, who was arrested in east London on suspicion of preparation of terrorist acts and later released on police bail, was also released with no further action.
Earlier on Saturday, officers released seven people with no further action and a 32-year-old woman who had been arrested in Manchester was placed on police bail pending further enquiries to a date later this month.
A 35-year-old man arrested in Manchester, a 21-year-old woman and a 23-year-old man arrested at the same address in Birmingham, as well as a 26-year-old woman and three men, aged 28, 27 and 26, arrested at separate addresses in Birmingham, were the others released on Saturday.