TOPSHOT - Security services staff pick through debris, including a car number plate, left following the March 22 terror attack on Westminster Bridge in central London 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 / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP via Getty Images)