The crowd was also played a video message from former England captain David Beckham.
After the Government committed to giving an extra £375 million to help feed the world's poorest children, Beckham said:
We've had good news. Earlier today the Prime Minister met with other world leaders and has made a real commitment to ending child malnutrition and hunger. There is more to do though and you can help.
More top news
Officers have moved to disperse activists who vowed to defy a ban on the gay Pride march in Istanbul.
Dozens of email accounts are thought to have been compromised in a "determined and sustained" attempt to access Parliamentary accounts.
Speaking at Glastonbury Festival, the shadow chancellor said people who died in the Grenfell fire were "murdered by political decisions".