Environmental campaigners had a bit of a wobble when they were forced to abandon a wire-walk using the Thames cable car.

Greenpeace activists were spotted attempting to walk along the Emirates Air Line at just after 5am on Friday, July 10, before having to come down as the wire was too loose.

The ambitious stunt was organised to target Shell staff working in Canary Wharf, protesting the company’s controversial plans to drill for oil in the Arctic.

Arctic campaigner Ian Duff said: “We were planning to do a record breaking high-wire walk over the Thames to protest Shell’s Arctic drilling plans.

“It was designed as a message to the 1,600 Shell staff in their Canary Wharf offices just across the water. Unfortunately once we were up there, we discovered the wire was just too wobbly to use.

“We made the call that it was too great a risk, and decided to come down.

“Unfortunately, Shell hasn’t yet made that call in the Arctic, despite the immediate dangers drilling poses for the people and wildlife that live there and the effect climate impacts are having on people around the world.”

Emirates Air Line boss Danny Price said: “Our security systems alerted us to trespassers on the Emirates Air Line this morning. The cable car was not running at the time and there is no risk to customers or staff.

“We are working with the police to deal safely with the situation and services are expected to resume later this morning. I apologise to customers whose journeys are disrupted in the meantime.”

A spokesman for the British Transport police confirmed nine people had been arrested.

He said: “We were called to the Emirates Air Line south terminal in Greenwich at 5.04am following reports of a number of protestors at the location.

“Officers liaised with the protestors who came down voluntarily shortly before 7.30am.

“Nine people have now been arrested on suspicion of trespass and suspicion of criminal damage and are currently in custody.”