Pictures from the scene show at least seven police vehicles on the scene – including a dog unit and two riot vans.
Cops confirmed the suspect was arrested on suspicion of affray after giving himself up.
It comes after a Year 11 pupil was stabbed with a “foot-long knife” in Forest Hill.
Pressure is mounting on the Government to act following the apparent increase in violence.
Beloved newsagent Ravi Katharkamar, 54, became the 28th murder in London in 2019 as he was stabbed to death in a violent robbery in Pinner.
The Government granted an additional £100 million in funding to tackle knife crime in the Spring Statement.
Police federation chairman John Apter however warned the cash was “nowhere near enough”.
It fell £200 million short of the amount asked for by police chiefs – with cops losing 20,000 officers since 2010.
A spokesman for the Met Police said: “Officers were called at 11.21am [this morning] to Holloway Road, N7.
“A man was reported to be in the street with a large knife or machete before entering a residential property.
“Officers attended and the man was arrested on suspicion of affray.
“He was taken into custody where he remains. No injuries were reported.”
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