Protests have continued in Portland resulting in local police discharging significant amounts of tear gas.

Footage from July 22 shows many protesters retreat after a confrontation with authorities.

The filmer, Tommie Norton, said: "I actually work at the detention center so I see this almost every day.

"The tear gas really burns, even with an N95!

"There were lots of people, even say a van delivering water and food!

"They seem prepared and I don’t anticipate they will leave anytime soon."