The statement was released following the information that two teenagers were stabbed to death in London and Greater Manchester over the weekend.
"In advance of the weekend just passed, we had arranged for more officers from our Violent Crime Taskforce to be on duty and we have extended their shifts to raise our visibility across London. These officers are operating across London in both uniform and plain clothes," McNulty said.
On Sunday, UK Home Secretary Sajid Javid said he would be meeting with police chiefs during the week to discuss solutions to the "senseless violence."
According to the London Metropolitan Police, knife crime surged by 16 percent in the capital in 2018. The UK National Health Service data shows that the number of children aged 16 and undertreated for stab wounds in England rose by 93 percent, from 180 admissions in the year 2012/2013 to 347 in 2017/2018.