According to The Sun, a recording was made on which Johnson can be heard shouting “get off my f***ing laptop”.
A neighbour heard a sound like “smashing” plates, along with “a couple of very loud screams” and a “loud bang” which shook the house, reported The Guardian.
Symonds was apparently unhurt.
Johnson and Hunt, whose odds on becoming PM shortened after the incident, will meet in the coming days for the first of 16 head-to-heads before the 160,000-strong Conservative Party membership votes for their new leader – the man who will become prime minister and replace the outgoing Theresa May.
Johnson won the last elimination vote among Conservative MPs with more than twice as many votes as Hunt (160-77).
A result is due in late July.
However, former attorney-general Dominic Grieve told BBC Radio 4’s Today Show that character would be an important element for voters to consider.
He said: “I think the issue of any candidate’s character, standing for the leadership of a party, and aiming to be a Prime Minister is going to be relevant.
Johnson split from his second wife, Marina Wheeler, last year, and is known for his complicated love life.
He married first wife Allegra Mostyn-Owen, who he met at Oxford University in 1987, and famously cheated on her with Petronella Wyatt, a society writer who was one of his columnists when he edited the right-wing Spectator magazine.
He was Mayor of London in 2008 when it emerged he had fathered a love child with an arts consultant.
Johnson has not commented on the incident in South London.
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