where violent clashes have erupted between riot police and pro-democracy protesters at the aurpt the airport there, one of the world's busiest. just look at this. this was the scene earlier at hong kong international airport as police in riot gear fought with all of these protesters after this police officer was beaten by his own baton, he pulled his gun and the demonstrators ran away. earlier, protesters moved seats and those luggage push carts as they ride to barricade the building. president trump has tweeted that the chinese government is moving troops to the border and just begging everyone to be safe. hong kong's chief executive is warning protesters not to push the city into the quote abyss. cnn's paula hancocks has been in the thick of it at the hong kong international airport, where it is now past 3:00 in the morning there. paula, what's the scene like