order less, or come from outside?

Readers might notice that there are riot control police from the places other than HK in this single picture.

The types of equipment are random.  There seemed to have roughly two kings of riot control police at first glance.  However, readers can tell the subtle parts of them.  Even the symbols are similar but still not identical.  Some put on full equipment, some did not.  There are combinations of suit and equipment.  It looks like the police are order less, or come from outside.