Four of London’s major bridges have been shut down.

On the first day of the Easter financial institution trip on Friday, the UK climate activist group Extinction Rebellion shut down four of London’s biggest bridges, causing traffic jams.

Extinction Rebellion stated that the protestors have shut the Blackfriars, Waterloo, Westminster, and Lambeth bridges, which span the River Thames.

“We have no choice but to disrupt as long as our government refuses to act now on the climate issue, ignoring expert advice, permitting more oil and gas drilling, and imprisoning scientists,” it stated.

The group warned that “we’re on course for a disastrous 3°C warming” above pre-industrial levels.

This figure would be substantially higher than the goal set in the 2015 Paris climate agreement to keep temperature rises between 1.5 and 2 degrees Celsius.

Nine scientists were detained following a protest against the energy ministry on Wednesday, and one of them went on a hunger strike the next day after being denied parole, according to the group.

On Twitter, the Metropolitan Police said it was aware of “pockets” of protesters “creating delays and inconvenience across central London,” and that officers were “trying to control the impact.”

In the recent week, the group has staged a number of protests, including shutting down the landmark Tower Bridge last Friday.

Members also converged on the headquarters of British energy giant Shell on Wednesday, with a few gluing their hands to the structure as they called on employees to resign.

Following the crisis in Ukraine and rising prices, the British government unveiled a new energy security strategy this week, focusing more on nuclear power and renewable energy, as well as North Sea oil.