Extinction Rebellion has admitted that their climate protest could disrupt emergency care at hospitals ahead of an attempted two-week shutdown of London.

Activists have vowed that the climate protest will be five times bigger than the one in April as they blockade Westminster in action that is likely to bring the capital to a standstill.

Police this weekend began rounding up some of the ringleaders as they raided a warehouse in south London amid concern that they have used a huge influx of funding to purchase sophisticated equipment to thwart officers.

They will take to the streets at 10am on Monday to blockade key locations including Westminster and Lambeth Bridges, Parliament Square, Downing Street and Whitehall.

Those behind the protest have now admitted that their action could have an impact on St Thomas’s hospital, which sits on the opposite bank of the Thames from the Houses of Parliament.

When asked on Sky News whether they were worried about disruption at the hospital, activist Savannah Lovelock said that they were “really sorry… but we are running out of time”.

They have said that they will stand aside to allow ambulances responding to emergencies to pass.