One of the protesters, Chris Howson, told the Newham Recorder that arms fairs like this one were "fuelling the wars of tomorrow".
He said: "We are here to pray for peace because most people have no idea that they are selling weapons that can be used to kill women and children.”
More top news
Taking a break from updates about the airport, the Twitter feed of Heathrow Airport has been speculating about possible football transfers.
Six of the top ten worst areas across the country for fly-tipping are in London.
A police officer was stabbed whilst another was bitten in separate incidents at the carnival weekend.