Copenhagen police detain 900 in climate change rally

Police in the Danish capital Copenhagen say 900 protesters have been detained following a huge climate change rally.

The move came after youths threw bricks and smashed windows as more than 30,000 demonstrators marched to demand action at the UN climate change summit.

Similar marches have been held in cities around the world, calling for decisive action on global warming.

Meanwhile, ministers have started arriving to join other delegates at the UN summit which runs for another week.

Documents prepared by the conference's leaders call on developed nations to cut greenhouse gas emissions by between 25% and 45% of 1990 levels by 2020.

EU leaders are offering developing countries a three-year deal that would pay them 7.2bn euros (£6.5bn; $10.6bn) to help cope with climate change.

The exact target for limiting temperature rise is unclear amid disputes between various blocs.

Danish police estimate that some 30,000 people joined the march while organisers put the number at 100,000.

They marched 6km (four miles) across the city to the conference centre where negotiators and ministers are meeting.

After violence erupted, large numbers of mainly young people were detained.

TV pictures showed the police putting the demonstrators in seated lines on the street with their hands tied behind their backs. They were later removed on buses.

Henrek Suhr, of Copenhagen police, told the BBC that their intelligence had suggested a small group of people had planned violence.

"We thought... these people would make a lot of trouble in Copenhagen had we not arrested them, and we arrested them because they had done a lot of things before our arrests. They smashed some windows at the foreign ministry," he said.

He rejected claims by climate protesters that some of those being held had been mistreated and denied access to basic needs.

Simon Sheikh, of the Australian social and political network "Get Up", said he had witnessed the detentions from his apartment in the centre of the city.

"It was unprovoked. They rounded up a group, including women and children, and pushed them into a store, before splitting them into groups and handcuffing them."

Activists are arguing for an ambitious, legally binding agreement on emissions cuts to be signed by world leaders at the summit's conclusion at the end of next week.

"This is the right time to shout out and let leaders know this is serious business for us all. Lets hope they listen," Lin Che, a 28-year-old student from Taiwan, told Reuters news agency.

A number of famous figures said they would join the protest, among them Bollywood actor Rahul Bose, model and photographer Helena Christensen and former UN human rights commissioner Mary Robinson

In Australia, where events were held as part of the country's fifth Walk Against Warming, the largest protest was held in Melbourne.

The march closed with protesters spelling out the message "Safe Climate - Do It!" on the ground.

Organisers said aerial photographs had been taken and would be sent to delegates at the talks in Copenhagen.

In Adelaide, activist James Dannenberg told state radio: "We want [world leaders] to bring home a treaty, we want them to stand by the Pacific and our neighbours there.

"And we want them to deliver and ensure a safe climate future for us all."

Thousands of demonstrators also gathered in front of Australia's parliament house in the capital, Canberra.