Photojournalism by Vicki Coe, Paula Goes, Steve Punter, Reynaldo Trombetta, and John Wood.
An estimated 35,000 protesters marched outside Westminster Palace Saturday to demand jobs, economic justice, and environmental accountability be discussed during the G-20 summit that begins this week.
The "Put People First" march culminated in Hyde Park for a rally that lasted through the afternoon. Saturday's events kicked off six days of protest.
The slide show below contains photographs submitted by HuffPost readers who attended Saturday's event. If you will be attending any G-20 rallies during the rest of this week, send your pictures to firstname.lastname@example.org.
Make sure to include your full name (so we can credit your work), where you are from, and a caption describing the context and location of each photograph.
If you are a citizen journalist looking for more information on the protests and events, check out Demotix. The HuffPost will be partnering with Demotix to cover the summit.
Not protesting? Sign up here to receive HuffPost World updates and learn how you can participate in our coverage.
Get the news first. Become a fan of HuffPost World on Facebook.