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"It was only a few minutes [but] it was an incredibly intense experience. I would've counted in maybe one or two minutes at least 10 Swat police with huge guns, helmets on, faces covered in balaclavas.
"They were just shouting at us to keep moving but every single police officer was looking you up and down."
As well as Swat officers, there were also the armed police, who normally guarded Parliament House, and regular police, Bourke said.
"There were police everywhere. I said to someone 'where did all these police materialise from?' He said 'they're always here, you might not see them, not the Swat police anyway, but they're always here."
Evacuees included ministers and schoolchildren, the latter a particularly distressing sight for Bourke.
"I found that incredibly haunting for those schoolchildren. very, very young maybe 5, 6, 7. Their first experience of their parliament is going to be a horrible terror attack."