Hong Kong police warn National Day protests will be 'very, very dangerous'

Hong Kong pro-democracy protests on Tuesday to mark the 70th anniversary of communist China's founding on Tuesday will be "very, very dangerous", police in the city warned Monday.

"After our analysis, we're expecting the situation tomorrow to be very, very dangerous," Superintendent John Tse told reporters. 

"Core rioters are increasing their violence. The depth and breadth of their violence and plans show that they are increasingly resorting to terrorism," he added.

Beijing is preparing for huge, tightly-choreographed festivities from Tuesday to mark the founding of the People's Republic of China, including a massive military parade that will revel in the country's emergence as a global superpower.

But ongoing unrest in Hong Kong threatens to upstage those celebrations as the semi-autonomous city boils with public anger over the erosion of its special freedoms under Beijing's rule.