Climate protests continued in London for a fourth day, with activists threatening to escalate their tactics if their demands are not met.

Metropolitan Police Commissioner Cressida Dick said more than 1,000 officers were being deployed to the streets of the capital each day of the protests.

A spokesman for the Extinction Rebellion group said activists will be staging protest action at Heathrow on Friday, with around 500,000 people expected to fly out for Easter breaks over the bank holiday weekend.

Climate activists at an Extinction Rebellion demonstration at Oxford Circus
Climate activists at an Extinction Rebellion demonstration at Oxford Circus (Kirsty O’Connor/PA)
Extinction Rebellion protests
Police officers with climate activists from an Extinction Rebellion demonstration at Oxford Circus (Kirsty O’Connor/PA)
Extinction Rebellion protests
The police presence in Oxford Circus (Jonathan Brady/PA)
Extinction Rebellion protests
Extinction Rebellion demonstrators at Oxford Circus (Jonathan Brady/PA)
Extinction Rebellion protests
Londoners faced a fourth day of disruption (Jonathan Brady/PA)
Extinction Rebellion protests
Time out for yoga on Waterloo Bridge (Jonathan Brady/PA)
Extinction Rebellion protests
Police officers carry a climate activist away on Waterloo Bridge (Jonathan Brady/PA)
Extinction Rebellion protests
Police remove a protester on Waterloo Bridge (Yui Mok/PA)
Extinction Rebellion protests
A climate activist is led away on Waterloo Bridge (Stefan Rousseau/PA)
Extinction Rebellion protests
A protester is led away on Waterloo Bridge (Stefan Rousseau/PA)
Extinction Rebellion protests
A climate activist knits at Oxford Circus (Yui Mok/PA)
Extinction Rebellion protests
An activist is removed at Oxford Circus (Yui Mok/PA)
Extinction Rebellion protests
People pass by the Extinction Rebellion demonstration on Waterloo Bridge (Stefan Rousseau/PA)
Extinction Rebellion protests
Climate activists surround a pink boat at Oxford Circus (Yui Mok/PA)
Extinction Rebellion protests
A climate activist is carried away at Oxford Circus (Yui Mok/PA)
Extinction Rebellion protests
A protester is led away on Waterloo Bridge (Stefan Rousseau/PA)
Protesters on London's South Bank
Protesters on London’s South Bank (Yui Mok/PA)