Protesters from campaign group Just Stop Oil have been arrested after taking part in a slow march in central London today.
Officers from the Metropolitan Police have arrested 16 of those involved.
One of those stuck in traffic included an ambulance on blue lights.
A spokesperson from the Metropolitan police said: "We are arresting Just Stop Oil activists causing disruption in Whitehall.
Traffic was building in Whitehall
Metropolitan Police
"These arrests are being made swiftly so we can release the traffic, which includes an ambulance.
"Officers have arrested all of the activists slow marching in Whitehall.
"Another ambulance, which is on blue lights, is stuck in the disruption this slow march has caused.
"All 16 of the activists have been arrested and their way to custody."
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Traffic was held in Central London
Metropolitan Police
Just Stop Oil has now posted about the march on their social media.
A spokesperson from the organisation said: "18 Just Stop Oil Supporters March from Trafalgar Square to Whitehall.
" Yesterday, three young people were sent to prison for marching, and 28 people are in police custody to appear in court today. Join us tomorrow, 12pm, Jubilee Gardens."
It comes after a demonstration staged by Just Stop Oil protesters was shut down by the police in just 11 minutes earlier this week.
The officers arrested 23 Just Stop Oil (JSO) members in just over 10 minutes.
The slow marchers were cleared off the road and moved onto the pavement.
The group is calling on the government to commit to ending new fossil fuel licensing and production.