As the world turned to watch London stage the G20 summit, hundreds of photographers trained their lenses on the protesters demonstrating against the gathering.

Below is a selection of the best from Your View readers.

View this week’s Your View showcase here.

When Ingolfur Juliusson’s first pictures of the riots in Iceland came in to Your View we had no pictures by Reuters photographers or stringers on our professional picture wire. Seeing this and the quality of the images, I sent them along to our chief photographer of the region. In cases where we use citizen journalists pictures on our professional wire it is usually the chief photographer who negotiates usage and payment for the photographer. As our chief photographer was out of the office and knowing that Europe was on deadline for these pictures, I contacted Ingolfur directly and negotiated a payment for 5 pictures.

The selection was quickly moved on the wire and it wasn’t long before we saw some online play.

This screenshot is from http://www.dn.se/

A number of Your View contributors have had their pictures moved on the Reuters Pictures wire.

Click here to view a slideshow and click here to view this week’s showcase.

Daphne Tolis sent in a series of pictures from the riots in Greece, with this one my pick of the bunch for its simple use of three elements to convey the scene: the smoke, the fire extinguisher and the masked riot policeman.

View this week’s You Witness slideshow here.

You Witness contributor Kathy de Foe captures the anguish of this protester after she is hit with pepper spray outside the Republican National Convention.

View this week’s You Witness slideshow here .

It’s all about the angle and emotion in this image by Sam Kang Li from a rally by Tibetan protesters in Nepal. Through the use of the angle you view the protesters from the police point of view. The raw emotion on their faces adds the human element to the photo.

View this week’s You Witness selection here.