Rotherham schoolchildren "perfectly safe" after being caught up in Westminster terror attack
Around 85 youngsters from Herringthorpe Junior School were on a visit to the Houses of Parliament when the incident happened.
Mandy Adams, school head teacher, said the youngsters had been involved in the lockdown but were "perfectly safe".
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Hide AdMetropolitan Police Assistant Commissioner Mark Rowley said four people had died in the incident - including a police officer and the alleged attacker.
A woman was among several pedestrians struck by a car on Westminster Bridge, before it crashed into railings.
A police officer was stabbed in the Houses of Parliament by an attacker, who was shot by police.
At least 20 people were injured, including three other officers.