The spokeswoman said it was too early to draw any links between the attacks, which come amid concerns over rising violent crime in the capital.
Two separate shootings took place in London within an hour killing a 17-year-old girl and leaving a boy, 16, critically-ill.
The murder rate in London over the past two months exceeded New York City's for the first time in modern history, according to reports. Fifteen people were murdered in the United Kingdom capital in February and 23 in March compared to 14 and 21 respectively in NY, a city with a similar population size.
Police are also appealing for witnesses after a man was stabbed to death in south-east London on Thursday night. Of the 47 murders in London so far this year, 31 have been committed with knives. Both cities hold populations of 8.5 million or better, but it was NYC that historically held the dubious record by a significant margin. NY has been able to bring down serious violence through a public health approach. "The government is determined to do everything it can to break the cycle".
Although Labour Mayor Sadiq Khan recently reinstated "stop and search" techniques to combat the violent crime wave, procedures changed significantly after critics blasted the previous policy for the "national controversy and local tension" caused by "black, Asian and ethnic minority people" being disproportionately searched, according to the Independent. Before him, Conservative Boris Johnson was mayor for eight years.
It attracted sustained criticism for targeting ethnic minorities, leading then-interior minister Theresa May, who is now prime minister, to introduce reforms in 2014.
Britain's most senior officer, London police chief Cressida Dick, said gangs were using online platforms to glamorise violence, adding that disputes between young people could escalate within minutes on social media.
The Ben Kinsella Trust, an anti-knife crime charity named after a young victim, said social media amplified a range of other factors that have contributed to the crisis.
"This has been a horrendous year".
Other friends told how they tried to comfort Tanisha in her last moments, staying by her side after the fatal shooting.
"We need to bring down the gangsters", he said.