Anti-war protesters have set up camp outside an arms fair, being held at London's ExCel centre.
The DSEI event is described as the world's largest fully integrated defence and security exhibition, with nearly 30,000 visitors and 1,500 exhibitors.
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Detectives are hunting two thugs armed with wooden stakes who left a man with multiple head fractures in a vicious attack.
Police have launched a manhunt following three attacks on women in south London that detectives say may be linked.
Khan, the Labour MP for Tooting, claims his plan to hold fares at 2016 prices until 2020 is fully costed.