But he said the police had taken away items which the protesters had taken to the campaign, including gazebos, oat milk and art equipment, although they have since been replaced with donations from other groups.
"Police wish to thank the many citizens who were inconvenienced this morning in traffic for their patience, while police negotiated a peaceful end to the protest".
Members of Extinction Rebellion said police confiscated six vehicles as well as gazebos, portable toilets and bean bags - and have since claimed that the arrests were pre-emptive.
"The main people we are trying to communicate with here is the Government".
On Saturday, officers used a battering ram to enter a building in south London where activists had been storing materials to use during the protests.
In Melbourne Extinction Rebellion protesters plan to occupy the CBD on Tuesday and are prepared for peaceful arrests.
"We have a planetary emergency, we need to take dramatic steps to reduce carbon emissions and try to save the planet", protester Kimball Cariou told CTV News Vancouver when asked why he was attending.
The police arrested 10 people during the raid, on suspicion of conspiracy to cause public nuisance.
Police say all 18 people were later released without charges.
Extinction Rebellion staged a short occupation of the bridge last December, but Monday's protest comes at a time when the Point Ellice Bridge on Bay Street is down to one lane of westbound traffic.
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About 500 protesters blocked Stout Street in the central Wellington.
In Amsterdam, hundreds of demonstrators blocked a major road outside the Rijksmuseum, one of the city's most popular tourist attractions, and set up tents.
City authorities had granted the group a licence to demonstrate on the condition that it not block traffic.
"We are out of time, there is none left, we have to act now", said a protester called Benjamin.
In Australia, hundreds of climate demonstrators blocked roads Monday afternoon, with police in Sydney arresting 30 protesters who had refused police orders to clear the road near Central Station.
Protester Elle van Zeeland told Dutch broadcaster NOS that the group is "staying here until the government meets its obligations".
Supporters of the Extinction Rebellion movement block a road at the Potsdamer Platz square in Berlin.
Jamie Russell, a 45 year old writer who is a member of the Shrewsbury Extinction Rebellion group, said there was frustration at a lack of action from government.
They also aim to shut down roads and stage a sit-in at London City Airport, among other demonstrations.
"All these movements that we have seen in recent times are global ones and with good reason - we'll only see the moves we need on climate change if we are taking global action", said Ardern.
In Berlin on Monday, around 1,000 people blocked the Grosser Stern, a traffic circle in the middle of the German capital's Tiergarten park dominated by the landmark Victory Column.