Pro-Democracy Activists In Hong Kong Have Again Clashed With Police...Demonstrators This Time Barricading A Tunnel Near Hong Kong's Government Headquarters Overnight Tuesday To Expand Their Protest Zone After Being Cleared Out Of Some Other Streets In The Latest Escalation Of Tensions In A Weeks-Long Political Crisis. The Demonstrators Blocked The Underpass With Tires, Metal And Plastic Safety Barriers And Concrete Slabs From Drainage Ditches.