"Some protesters came to occupy Lung Wo Road because they were unhappy that the police had cleared the road barriers in Queensway.They mobilised people via the [internet] and vowed to let the police pay the price." At about 2.45am hundreds of police officers marched west and east on Lung Wo to Tamar Park, trapping hundreds of protesters.Using pepper spray and riot shields, the officers collared some and dragged them away, leaving people to try to flee the enclosed area, some by climbing over the barricades on Tim Wa Avenue. His pleas were drowned out by the protesters' screams.

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A South China Morning Post reporter was hit on her leg with a chair thrown aside by approaching officers. A hairdresser, aged 27, said the overnight clearance was the most chaotic scene he had experienced in the eight days he had camped outside the Chief Executive's Office.

Lawmaker Leung Kwok-hung, known as "Long Hair", of the League of Social Democrats, appeared to panic. "Some police officers dragged protesters who were already pushed to the ground … They pulled down tents when people were still in them." The police, he said, "were fuelled by hatred". "They not only pushed the crowd back, they punched the protesters," Yip said.

Hours later, broadcaster TVB aired footage appearing to show police officers in vests escorting a protester with bound hands to a dark corner, away from the crowds.

An effort by police to clear protesters' barricades near government offices, which mushroomed into a melee involving 45 arrests and cries of police brutality, started with a casual comment posted on the local online chat room Hong Kong Golden.

The line, inserted around noon, read: "Fight again on Lung Wo Road tonight".

The writer signed off as Pei-Yi-Sau, but the person's real identity is not known.

Some protesters, unhappy with what they called "failed" strategies of the Federation of Students, tried to mobilise chat room members after police destroyed barricades on Queensway on Tuesday.

They vowed to block Lung Wo Road, the main route to the chief executive's office in Admiralty.

Before 10pm on Tuesday, dozens of youths blocked the west-bound traffic of Lung Wo Road with barricades. Tensions flared after the officers tried to subdue and take away a young protester.

After about an hour, the police, outnumbered by the crowd, retreated. At about midnight, a thread on Hong Kong Golden suggested that water tanks be deployed to flood the tunnel. At 1.10am yesterday, another thread thanked members of another online chat room, Hong Kong Discuss Forum, for helping. Many worked to erect barriers inside the Lung Wo tunnel, piling plastic street barriers and concrete drain covers to block the tunnel.

A teenage protester said the new road blocks were created after police destroyed the elaborate barricades on Queensway - flattened by officers in 45 minutes on Tuesday.