Sadiq Khan has slammed "extremely dangerous" protests carried out by Extinction Rebellion on the London Underground this morning.
The London Mayor said demonstrations by climate activists at Stratford station, Canning Town and Shadwell were "counterproductive" and causing "unacceptable disruption".
Climate change activists climbed on top of tube trains and glued themselves to carriages in an effort to draw attention to the "climate emergency".
One demonstrator who was stood on top of a train at Canning Town was physically dragged from it by angry commuters, and another demonstrator at the same station claimed to have been "attacked by a mob".
In a statement, Mr Khan said: "I strongly condemn the Extinction Rebellion protesters who have targeted the London Underground and DLR this morning.
Protesters climbed on top of tube trains this morning
"This illegal action is extremely dangerous, counterproductive and is causing unacceptable disruption to Londoners who use public transport to get to work. It is also an unfair burden on our already overstretched police officers."
He continued: "I urge demonstrators to protest peacefully and within the boundaries of the law."
His statement comes after Conservative mayoral candidate, Shaun Bailey, criticised Mr Khan for his handling of the protests.
The Mayor had said he was not made aware of the police imposing a ban on Extinction Rebellion protests in central London earlier this week, and wanted to "find a way for those who want to protest the climate emergency to be able to do so".
But Mr Bailey told talkRADIO Mr Khan needed to "back the police".
"They've had nine days of protests - I think that's their point well made. We need to get London moving," he said.