"All occupants of the address" were "safe and well", a police statement reads, noting that "there were no offenses or concerns apparent to the officers and there was no cause for police action".
The neighbour had knocked on the door but received no response, according to The Guardian.
Boris Johnson and Jeremy Hunt will compete to become Britain's next prime minister in a runoff vote by members of the governing Conservative Party.
Boris Johnson and Jeremy Hunt have begun efforts to win over Tory members against a backdrop of infighting, a looming by-election and a fresh warning from Brussels about Brexit.
The argument could be heard outside the property where the potential future prime minister is living with Symonds, a former Conservative party head of press.
After the MPs whittled down the original field of 13, it is now up to the 160,000 or so paid-up Conservative members who select the centre-right party's next leader.
"All the dark ops we have been hearing about don't cast a good light on politicians and they don't cast a good light on politics", she told BBC Radio 4's Today programme.
On the £39 billion Brexit financial settlement to the European Union, he said: "I think it is important that as the UK's negotiator we should retain some creative ambiguity about the money until such time as we get a resolution".
Symonds, 31, a former Conservative Party press chief, has been living at the flat with Johnson, 55, the former foreign secretary, since he split from his wife Marina a year ago.
Given Symonds was shouting phrases like "get off me", it's right that the neighbour phoned the police.
He spoke publicly about the incident for the first time after concerned neighbours called 999 over raised voices in his South London home.
The final outcome of the leadership contest will not be known until the week beginning July 22, with the two remaining candidates taking part in a series of hustings in front of Tory members around the country before the votes are counted.
There were gasps as the fifth ballot was announced on Thursday evening in committee room 14 in Parliament, leaving Mr Johnson and Mr Hunt as final two.
British pol Boris Johnson - the United Kingdom bookies' favorite to replace Theresa May as prime minister - got into a nasty beef early Friday with his much younger, live-in gal pal, according to reports from the UK.
The Saturday "hustings" was the first of more than a dozen such party meetings set to take place across Britain in coming days.
Mr Johnson said it is not in the interests "of our friends and partners, I believe, unilaterally to impose tariffs if we decide not to".
She was in the audience during Johnson's leadership campaign launch on June 12 and has been credited in the media with smartening up the leadership hopeful's look.
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