Police have so far arrested 21 climate activists at the start of two weeks of planned peaceful civil disobedience in London that will call for urgent government action to curb carbon emissions.

The protests, which organizers expect to bring 10,000 people to the British capital, are part of what extinction rebellion activists call an “international rebellion”, with similar actions taking part in Australia, the Netherlands and Elsewhere.

Activists block a bridge and several roads as the protests gathered pace early on Monday.

Extinction rebellion came to prominence in April when it disrupted traffic in central London for 11 days.