Riot police have fought running battles with anti-globalisation protesters near world trade talks in Hong Kong, in the worst violence there for 16 years.
Protesters with bamboo sticks stormed police lines, as officers used pepper spray and batons to push them back.
Nine hundred demonstrators have been “rounded up”, police say, and are being held on a road near the talks venue.
Forty-one people are reported to have been injured in the clashes, five of them police, the authorities say.
Talks have failed to agree on a firm date for ending farm export subsidies, the draft summit declaration shows.
The US and developing states wanted a 2010 end date, but the EU has rejected this.
The commitment to open up service markets stays in the draft, despite complaints from some developing states.
The six-day talks are due to end on Sunday, but some delegates from the 149 states have threatened to walk out if their concerns are not addressed.
Brazil has said it does not think trade talks will be able to take the process much further, and has pledged to renew its call for a summit of world leaders.
“There is a need to inject political energy into the negotiations,” Foreign Minister Celso Amorim said, following the release of the draft text.
Protesters led by South Korean farmers had vowed to step up action against the world trading system on Saturday.
Running battles broke out as demonstrators approached the conference centre, which was briefly sealed off during the unrest.
Previously, clashes had been confined mainly to a designated area near the site.
But masked demonstrators have also been fighting with police in several places around the business district of the city.
A senior government official appeared on television to warn people to avoid the unrest.
Correspondents at the conference centre report that there is a now a non-violent stand-off between police and protesters – who have pledged to stay all night.
The scuffles have involved South-east Asian groups, European activists and South Korean farmers, who are among the most heavily subsidised in the world.
The protests came as delegates studied the text of the draft agreement, which has been condemned by some developing countries for not addressing their concerns.
Many feel they are being pressed too hard to allow foreign competition in service industries.
And some are also likely to be disappointed by the lack of progress on a plan to give duty-free and quota-free access to exports for the world’s least-developed states.
Some African countries have been seeking the elimination of subsidies for rich-country cotton farmers.
The draft stops short of that, suggesting instead that they should be cut further and more quickly than for other farm products.
But the draft text asks rich states to scrap export subsidies for cotton by 2006, to help West African producers.
However, the EU has none and the US is already in the process of eliminating its main cotton export supports.
Relief agencies criticised the draft.
ActionAid called it a “a disgrace and an insult to poor people all over the world”. BBC