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A picture shows red London buses, pedestrians and traffic crossing Westminster Bridge over the River Thames with the Union flag atop the Houses of Parliament (R) flying at half-mast in central London on March 23, 2017. 
Britain's parliament reopened on Thursday with a minute's silence in a gesture of defiance a day after an attacker sowed terror in the heart of Westminster, killing three people before being shot dead. Sombre-looking lawmakers in a packed House of Commons chamber bowed their heads and police officers also marked the silence standing outside the headquarters of London's Metropolitan Police nearby.
 / AFP PHOTO / Niklas HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
A picture shows red London buses, pedestrians and traffic crossing Westminster Bridge over the River Thames with the Union flag atop the Houses of Parliament (R) flying at half-mast in central London on March 23, 2017. 
Britain's parliament reopened on Thursday with a minute's silence in a gesture of defiance a day after an attacker sowed terror in the heart of Westminster, killing three people before being shot dead. Sombre-looking lawmakers in a packed House of Commons chamber bowed their heads and police officers also marked the silence standing outside the headquarters of London's Metropolitan Police nearby.
 / AFP PHOTO / Niklas HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)

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Police: Significant arrests made overnight

Acting Deputy Commissioner Mark Rowley of the London Metropolitan Police announces that significant arrests have been made in connection with the terror attack in central London.

Police: Significant arrests made overnight

Acting Deputy Commissioner Mark Rowley of the London Metropolitan Police announces that significant arrests have been made in connection with the terror attack in central London.