A prominent journalist has said the Westminster attacker must have had support in carrying out yesterday's atrocities - even though he acted alone.
A man carrying two knives was shot dead in the grounds of the Palace of Westminster after fatally stabbing a police officer and mowing down pedestrians in a car on Westminster Bridge.
The Metropolitan police have confirmed five people, including the attacker, have now died. Eight people have been arrested after raids at six locations around Birmingham and London, while Theresa May has said the attacker was British-born and known to authorities.
Robert Fox, defence editor for the London Evening Standard, told Julia Hartley-Brewer: "The perpetrator who does it is the marauding loner, but he or she doesn’t act entirely alone.
"This guy was acting alone, but he would have needed support. He’ll have needed to know how to get to Parliament.
"He caused a lot of mayhem along the way, but any possible associates are important."