Four people are dead, including the perpetrator, and 20 injured in an attack by Westminister in London.
The U.S. is sending messages of solidarity, while the French believe at least 3 school children on a field trip have been injured.
Our London correspondent Olly Barratt has an update:
IN: "Four people...
OUT: ...some description."
DUR: 20
From London, Olly Barratt reports that London's Metropolitan police believe this was a lone attacker.
IN: "Mark Rowley...
OUT: ..by any means."
DUR: 25
Our London correspondent Olly Barratt says there is an investigation underway to determine if the attacker had any help or support.
IN: "If this was...
OUT: ...as possible."
DUR: 22
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