BBC News
Anti-nuclear protesters used a 25ft model of a Trident submarine to bring traffic to a standstill in Edinburgh.
Scottish Socialist Party MSP Rosie Kane was among about 20 people who took part in the demonstration outside Holyrood.
Traffic had to be diverted as a result of the protest, which was organised by the Trident Ploughshares group.
SSP MSP Carolyn Leckie was told to leave the chamber during First Minister's Questions for refusing to put down a support the protest poster.
Her sign read: "Rosie Kane is not at FMQs because she discovered WMDs."
She was asked to leave after Presiding Officer George Reid said she was guilty of "disorderly behaviour".
Ms Kane said MSPs were not representing the views of the 70% of the Scottish public opposed to Trident.
"Many of us in different parties have tried over a long period of time to get the Scottish Parliament to at least speak up about this," she said.
"Until we get the powers to do something about it ourselves, we will do something on the streets.
"As an MSP, I am simply representing the wishes of the people of Scotland."
The demonstration blocked the Canongate at the bottom of the Royal Mile.
Police said they would not be forcing the protesters, who said they had chained themselves together inside the silver mock submarine, to move on.
The campaigners included 53-year-old Angie Zelter, who said: "Our message is that it's up to Scotland to try and get rid of Trident.
"We have to obey international law ourselves and stop being hypocritical. We are going to stay here until we are dismantled."
