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
Newly re-elected Labour leader Jeremy Corbyn describes his relationship with Mr Khan as "fine", even though they haven't spoken recently.
The kittens were in a poor condition when they were rescued, but are now putting on weight and will soon be ready for new homes.
Ian Bashford was just 200 metres from the finish line when he was struck by the car.