Some Hong Kong protesters escaped police by lowering themselves off a bridge and speeding away on motorcycles

Hong Kong Polytechnic University remains sealed off with many pro-democracy, anti-government protesters trapped on campus as fears of violent clashes with police intensify.

At least some demonstrators escaped at great personal risk, as dozens of protesters lowered themselves more than 30 feet down from a bridge with plastic hosing before jumping onto the back of waiting motor bikes and speeding off while police fired projectiles, Reuters reports.

Not everyone fled the scene successfully, however. A Reuters reporter who captured footage of the escape later said that it appeared several of the protesters were arrested.

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Meanwhile, two "prominent figures" were allowed onto campus by police to mediate with the demonstrators, signaling a growing risk of violence, Reuters reports.