Another location was an arts centre that was exhibiting some of the structures used in last year’s blockade of newspaper printing plants last year.
Extinction Rebellion has planned further protests against the owners of the UK’s press outlets this weekend,
It has been reported that they will unite with the Black Lives Matter campaign against racial injustice.
Scotland Yard in a statement said it had “taken proactive action to prevent and reduce criminal disruption which we believe was intended for direction at media business locations over the weekend”.
A spokesperson added that 12 people had been arrested in three raids across the capital.
The spokesperson said: “During the arrests, a number of items were seized by officers.
“These items included bamboo structures, lock-on equipment and other items.
“These items could be used to cause criminal damage and obstructions.
“Those arrested have been taken to police custody as inquiries continue.”
