The force made the plea after several members of the public took matters into their own hands.
This included "showing clearly that there is an obstruction, that it is deliberate, that it is unlawful, and finally within the context of protest, that it is unreasonable in all of the circumstances", he added.
"Without this evidence, any prosecution may fail and the offenders will not be held to account for their actions." He said the force is "determined to bring to justice all of those who have caused significant and unreasonable disruption to London, or caused damage to buildings, property or valuables".Some members of the public took matters into their own hands in London on Saturday
On Saturday, campaigners from the group sat in Charing Cross Road, Kensington High Street, Harleyford Street and Blackfriars Road, demanding the government halts new oil licences.in Harleyford Street to remove demonstrators, who persistently returned to retake their places in the road.
During the protest one motorist said: "We've asked you nicely, you are doing the wrong thing by blocking innocent people going about their business."You are stopping the wrong people, I've got to go pick my kids up, I've got to get my lorry back to work. We can't help you, go to Westminster."- by the group in recent months.