More than 500 people have been arrested since Monday and three charged with gluing themselves to a train as activists continue to block traffic at four sites in the capital.
"Climate catastrophe is the issue and solidarity with Extinction Rebellion".
Climate change protestors also gathered at Heathrow Airport on Good Friday after threatening to disrupt flights on one of the airports busiest days of the year.
"In order to impose this condition, the Met required evidence that serious disruption was being caused to communities in London", the police said.
Extinction Rebellion said police had warned the youngsters at Heathrow that they could be arrested.
Home Secretary Sajid Javid said protesters "do not have the right to break the law and significantly disrupt the lives of others".
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The opponent, it's not that they know how to play, but they play with two or three players. The Reds star only signed a new five-year contract last July at Anfield.
"We expect our officers to engage with protesters but clearly their actions fall short of the tone of the policing operation at a time when people are frustrated at the actions of the protesters". Speaking of the protests, Thompson said she couldn't attend from the beginning as she was celebrating her birthday.
The protests did not cause major travel disruption on Friday during one of Britain's biggest holiday weekends, but police said they have now arrested more than 682 people.
So far, the protests are estimated to have cost more than 12 million pounds to businesses in London's West End, with some seeing a 25 per cent drop in sales.
"It's certainly an option that tactics will be escalated if our demands are not met", she said.
Ken Marsh, chairman of the Metropolitan Police Federation, told BBC Breakfast on Friday that protests had been "very, very difficult" for the force because it was an "alien" situation for a lot of them.
Britain has lowered net emissions by 42 per cent since 1990, and now aims to cut emissions by 80 percent by 2050. Government advisers are expected to put forward new targets next month.