More than 250 people have attended a public meeting to discuss the recent spate of violence in south-east London.
Police believe Michael Dosunmu was mistakenly targeted
Three people, including a 15-year-old boy, were killed and one was injured in Peckham between 3 and 6 February.
Southwark Council leader Nick Stanton said the large attendance proved "how strong and tight-knit the people of Peckham are".
Borough Commander Malcolm Tillyer reassured residents that police were listening to their concerns.
Monday's meeting, at the Learning and Business Centre in Cator Street, was attended by officers involved in the investigations, councillors and local MP Harriet Harman.
'Enough is enough'
Meeting chairman Decima Francis, of mentoring group From Boyhood to Manhood Foundation, said those who attended recognised they had a role to play in changing Peckham.
"People have got to the point where enough is enough," she told the BBC News website.
"The meeting was about parents and adults saying we need to take responsibility."
Ms Francis said she sensed a "quiet determination" in the community to work together and engage in "real community networking".
Ch Supt Tillyer paid tribute to the hundreds of people of Peckham that attended the meeting.
"They made their messages clear," he said.
"Southwark police see this type of meeting as an opportunity to reassure the community and make it clear that we are listening to their concerns."
The killings began on Saturday 3 February, with the stabbing of Javorie Crighton in Haslam Street.
The next day, one man, who has yet to be named, was shot dead and another wounded on Clayton Road.
And in the early hours of Tuesday, gunmen stormed into 15-year-old Michael Dosunmu's home in Diamond Street and shot him dead as he slept.
Southwark Council leader Nick Stanton said all those who attended the meeting "demonstrated huge spirit and determination".
"They proved how strong and tight-knit the people of Peckham are and how they will not be beaten by the very small minority who get involved in serious criminal activity.
"I was particularly encouraged by the willingness of the community to seek positive solutions in which we all work together to build a safer Peckham."