Head techer of Fircroft Primary School in Tooting, Anne Wilson, speaks of the pain felt by everybody at the school, pupils and adults alike, after hearing that Imani Green had been killed.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.