29-year-old Hassan Hussain and 20-year-old Yassin James sprayed bullets at Sabrina Moss and her friends as they sheltered from the rain outside a bar.
Her friend Sabrina Gachette was lucky to survive after being hit in the back with a sawn off shotgun during the attack on the high street in South Kilburn.
The two women were only hit because they were standing next to the intended targets - members of the South Kilburn Gang.
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David Cameron said the Met proved it can "do more with less" and declined to criticise the Mayor of London for his water cannon spend.
A group of disabled activists threw toys and balls at him as he entered the conference.
A wet start to the week and the unsettled weather is set to continue over the next few days.