Police have detained three women on suspicion of preparing or instigating terrorism acts. One of the arrested women had been shot by police last week during an intelligence-led raid.
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London Metropolitan Police announced on Monday that they had arrested an additional three suspects as part of an "ongoing intelligence-led operation" that had already resulted in the detention of six other individuals in London and Kent.
According to Scotland Yard's statement, officers from the Counter Terrorism Command carried out warrants for three addresses in East London. The three women, ages 18, 19 and 21, are being held at a police station outside of London under the Terrorism Act.
The 21-year-old suspect had been shot and seriously injured by police during last Thursday's raid on a house in Willesden, an area of northwest London. The woman was discharged from the hospital on Sunday prior to her arrest.
None of the suspects have yet been identified or charged.
The past week has seen an uptick in police detentions related to counter-terrorism operations in and around the British capital.
The political center of Great Britain remains on edge after the March 22 terror attack, in which attacker Khalid Masood mowed down pedestrians on Westminster Bridge before stabbing a police officer inside the gates of Parliament. Masood was shot dead on-site.
cmb/rt (AP)
Attacks on UK Houses of Parliament in London
The London Police are treating the back-to-back series of violent attacks as a "terrorist incident." The attack outside parliament killed four people, including the attacker.
Image: Reuters/E. Keogh
Shots ring out
Shortly before 15:00 UTC, multiple shots followed by screaming were reported outside London's Houses of Parliaments. Authorities rushed to the scene as the House of Commons went into lockdown. The first reports came in from political reporters barred from leaving the premises.
Image: Reuters/E. Keogh
Injuries on Westminster Bridge
A male attacker first ran down pedestrians with an SUV on Westminster Bridge, an area highly frequented by tourists. The vehicle then rammed into a gate near Big Ben.
Image: Reuters/T.Melville
Police cordon off the area
The knife-wielding assailant then fatally stabbed a police officer on Parliament's grounds. The attacker was subsequently shot and killed while authorities secured the area around the Palace of Westminster.
Image: Reuters/S. Wermuth
An attack in the heart of downtown London
Transport for London, greater London's public transport authority, diverted buses in the area of the attacks. People working in the area sought alternative routes home as traffic remained blocked at the end of the work day on Wednesday.
Image: Google Maps
International leaders react
International leaders offered their condolences following the attack. German Chancellor Angela Merkel reaffirmed Germany's support for the UK "in the struggle against all forms of terrorism." The Scottish First Minister Nicola Sturgeon also expressed her sympathies as the Scottish Parliament canceled a debate on a second independence referendum.
Image: Reuters/K. Pfaffenbach
Emergency response blankets the area
Individuals present in the affected area described sirens blaring and the drone of helicopters overhead. British media reported "catastrophic injuries" while police confirmed four individuals had been killed. Another 29 people were being treated in hospital for their injuries - seven of them were critically wounded.
Image: Reuters/S.Wermuth
Police raid homes in Birmingham and London
A few hours after the attack, police made eight arrests after conducting armed raids on six homes in London and the central city of Birmingham (pictured above). The raids were part of an investigation into the Westminster attacker.
Image: picture-alliance/dpa/R. Vernalls
Attacker 'acted alone'
Metropolitan Police counterterrorism chief Mark Rowley told reporters that he believed the assailant "acted alone" and that he was "inspired by international terrorism." Prime Minister Theresa May later said the attacker was British-born and was known to authorities.
Image: Getty Images/AFP/J. Tallis
'IS' claims attack
The militant "Islamic State" (IS) group claimed responsibility for the attack later on Thursday, saying the attacker was one of its "soldiers," according to the IS Aamaq news agency. It was not immediately clear whether the attacker was directly connected to the group.
Image: Reuters/S. Wermuth
Normality is 'greatest response to terror'
Prime Minister May hailed the millions of people in London who went about their lives the day after the attack. "It is in these actions - millions of acts of normality - that we find the best response to terrorism," she said. The city will hold a candlelight vigil for the victims on Thursday evening.