Protesting firefighters brought proceedings at City Hall to a standstill today, as they confronted Boris Johnson.
Mayor's Question Time had to be halted until order was restored - and all of it was witnessed by children visiting from a primary school in Croydon.
Carolyn Sim reports.
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The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The family of the police officer who was murdered in the Westminster attack have thanked those who were with him 'in his last moments'.