Police are appealing for information after two lone women were stabbed in potentially linked incidents in Wapping.
Two women, aged 38 and 26, were attacked in two separate incidents over the past 15 days.
Police say the similarities in the attacks suggests it might be the same man.
Anybody with information should call Tower Hamlets Police on 101 or, to remain anonymous, Crimestoppers on 0800 555 111.
More top news
The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.