The Prime Minister has described the video footage that emerged of MP Mike Amesbury appearing to punch a antheral to the crushed arsenic "shocking".
Amesbury has been suspended from the enactment and has had the Labour whip withdrawn aft the CCTV and mobile telephone footage appeared connected Sunday.
Sir Keir Starmer said the enactment had “moved precise swiftly” to respond.
He added: "There is present a constabulary probe and successful the circumstances you'll admit there's not overmuch much I tin accidental astir that."
Cheshire Police said a 55-year-old antheral had been voluntarily interviewed nether caution successful narration to the incidental and was aboriginal released pending further inquiries.
Amesbury has been contacted for comment.
Posting connected his ain Facebook leafage connected Saturday, the backbencher said: "Last nighttime I was progressive successful an incidental that took spot aft I felt threatened pursuing an evening retired with friends.
"This greeting I contacted Cheshire Police myself to study what happened.
"I volition not beryllium making immoderate further nationalist remark but volition of people cooperate with immoderate inquiries if required by Cheshire Police."
In a connection issued earlier the Daily Mail footage emerged, Cheshire Police had said they were "called to reports of an battle successful Frodsham" astatine 02:48 BST connected Saturday 26 October.
“A caller reported helium had been assaulted by a antheral successful Main Street. Enquiries are ongoing," the constabulary added.
In footage obtained by the Daily Mail, the Runcorn and Helsby MP is seemingly seen continuing to deed the antheral arsenic helium lies successful the street.
A antithetic video, posted connected X, purported to amusement Amesbury shouting and swearing astatine the antheral lying successful the thoroughfare successful Frodsham, Cheshire.
In the archetypal clip, Amesbury tin beryllium heard shouting: "You won't endanger the MP ever again, volition you?"
'Questions to answer'
A Labour Party spokesperson said: “Mike Amesbury MP has been assisting Cheshire Police with their inquiries pursuing an incidental connected Friday night.
"As these inquiries are present ongoing, the Labour Party has administratively suspended Mr Amesbury’s rank of the Labour Party pending an investigation.”
A Conservative Party spokesperson said Amesbury "has questions to reply astir his actions", adding that it was "right they are thoroughly investigated".
A spokesperson for Reform UK - whose campaigner came 2nd down Amesbury successful July's wide predetermination - called for him to resign.
The MP was archetypal elected to the Commons successful 2017 representing Weaver Vale.
In the past predetermination helium was selected for a redrawn constituency of Runcorn and Helsby.
He was elected successful the July wide predetermination with a bulk of 14,696.
A erstwhile shadiness lodging minister, helium is presently a subordinate of 2 Commons committees - the Housing Communities and Local Government Committee and the Modernisation Committee.
In July 2023, a 56-year-old antheral was recovered guilty of stalking and harassing Amesbury astatine his constituency bureau and successful town.
The Manchester-born MP is simply a erstwhile careers advisor and has worked with Deputy PM Angela Rayner and Greater Manchester Metro Mayor Andy Burnham.