London attack

But the three men failed to provide payment details and the vehicle was not picked up, prompting them to use a smaller van from a DIY store instead.

The men drove into pedestrians on the bridge before stabbing people in Borough Market seven days ago.

Police said the men tied 12in (30cm) pink ceramic knives to their wrists and had petrol bombs in the van.

Eight people were killed and dozens more were injured in the attack, which began shortly before 22:00 BST on 3 June.

A 30-year-old man previously arrested in Birmingham "on suspicion of preparation of terrorist acts" was freed Saturday, the police said in a statement.

In addition, 11 others who were previously arrested in connection with the attack investigation have all been released with no further action, police said.

The attacker, Khalid Masood, 52, was shot dead by a police firearms officer at the scene of the March 22 incident.

Following last week's terrorist attack in London, the UK government is accusing technology firms to give terrorists "a place to hide," saying Intelligence agencies must have access to encrypted messaging applications such as WhatsApp to prevent such attacks.

Janet Ajao said she had "shed many tears for the people caught up in this horrendous incident".

Masood killed three people when he drove a car into pedestrians last Wednesday. He then fatally stabbed a police officer before being shot dead.

Meanwhile, police say no evidence has been found of links between Masood and so-called Islamic State or al-Qaeda.

Mrs Ajao, from Trelech in Carmarthenshire, said: "I wish to make it absolutely clear, so there can be no doubt, I do not condone his actions nor support the beliefs he held that led to him committing this atrocity.

Khalid Masood was active on the encryption messaging service WhatsApp two minutes before he started his attack Wednesday on Westminster Bridge, but no evidence has emerged to show he was communicating with ISIS at any point, the official told CNN.

Investigators are looking into communications he had with individuals leading up to the attack that left four dead, including a police officer, the official added.

Khalid Masood was active on the encryption messaging service WhatsApp two minutes before he started his attack Wednesday on Westminster Bridge, but no evidence has emerged to show he was communicating with ISIS at any point, the official told CNN.

Investigators are looking into communications he had with individuals leading up to the attack that left four dead, including a police officer, the official added.

The fourth victim, a 75-year-old man, died Thursday night after his life support was withdrawn at a hospital where he had been receiving treatment, according to London's Metropolitan Police.

Arrests were made in London and Birmingham, while homes were also searched in Brighton and Carmarthenshire, in South Wales.

Police said the addresses were "linked to the investigation" of Wednesday's attack, carried out by 52-year-old British man Khalid Masood.

Masood, 52, was born as Adrian Elms in Kent and was shot dead by police. He had not been the subject of any current police investigations.

PC Keith Palmer, 48, Aysha Frade and US tourist Kurt Cochran, 54, were killed on Wednesday, while a 75-year-old man died on Thursday evening.

The so-called Islamic State group has said it was behind the attack.

Donald Trump Jr tweeted an article written last year, in which Sadiq Khan said terror vigilance had become "part and parcel" of life in a global city.

"You have to be kidding me?!" said Mr Trump, immediately sparking accusations that he was exploiting the tragedy and misrepresenting the mayor's point.

Dozens were hurt in the London attack.

Scores more people were hurt when the attacker plowed his car through a crowd of people on a bridge over the River Thames, got out of his vehicle and fatally stabbed police officer Keith Palmer, a 15-year-veteran who was unarmed, on the grounds of Parliament.

An armed officer shot the assailant dead.

Mark Rowley, Britain's most senior counterterror police officer, told reporters late Wednesday that authorities believe they know the attacker's identity but are not releasing it, and are operating on the assumption the incident was "Islamist-related terrorism."