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All Tube staff are to be balloted for strike action in an escalating row over the sacking of a ticket barrier worker following a fracas with an alleged fare dodger.

The RMT union has already announced staff at London Bridge station are to stage a 24-hour strike from 10pm on Sunday night.

Today, union bosses said they are extending the ballot to all Underground staff in support of their London Bridge colleague.

According to the RMT, the ticket barrier worker had “intervened to stop a violent assault on fellow staff members including one who was pregnant” last November.

But London Underground said the RMT’s version of events is “simply not true” and CCTV footage from several angles shows the staff member “displaying unacceptable conduct when dealing with a member of the public”.

All RMT members at London Bridge station will walk out from 10pm on Sunday, May 7 until 10pm the following night.

From 10pm on Monday night, RMT members will take industrial action by not servicing any ticket machines, not challenging any customers who refuse to produce a valid ticket, oyster card or contactless card.

RMT said they were escalating the dispute and ballot all London Underground staff.

Voting in the strike ballot will start on May 10 and end on the 25th.

A TfL source told the Standard they do not expect the whole Tube network to vote in favour of strike action.

They said Waterloo station was already been balloted for industrial action but not enough people voted in support of strike action.

According to the RMT, the fare-dodger assaulted two members of staff including pushing a pregnant woman in the stomach and punching another staff member twice.

The staff member who was punched has since been sacked while two other members of staff being disciplined.

RMT general secretary Mick Cash said: “Despite the spin from LU the facts of this case remain the same. ‎It is about a fare dodger stopped and asked to pay his way who then turns violent and attacks staff doing their job. LU's message to thugs is that you can keep on fiddling your fares and lay into staff with impunity and it will be the front line tube workers who get the sack. It is outrageous.

“This is one of the most appalling abuses of the LU disciplinary procedure that RMT has ever come across. This was a shocking, violent incident and those that bore the brunt of it should have been supported and commended by the company. Instead they have been sacked or disciplined in what is the most appalling multiple miscarriage of justice.

"LU have flouted their own zero tolerance policy, their own duty of care to their staff and have sent out a message to fare dodgers and yobbos that staff can be treated as punch bags with impunity.

“That is an outrage that has enraged every single tube employee who risks their neck on the stations and platforms against a backdrop of a growing pattern of abuse and violence. It is also an insult to the three million tube users who pay their fares without expecting a free ride."

“RMT’s executive has noted the aggressive and intransigent stance adopted by tube bosses and has now decided to escalate to a ballot of all station staff.

“London Underground should do the decent thing – reinstate our member, lift the disciplinary action and send out the message that fare-dodging and violence will not be tolerated and that staff in the front line will get the support and assistance that they need.”

Brian Woodhead, operations director for London Underground, said: "The version of events described by the RMT union is simply untrue.

"CCTV footage from a number of different angles clearly shows a staff member displaying unacceptable conduct when dealing with a member of the public.

"The member of staff was dismissed following a full and thorough investigation.

"We have subsequently invited the general secretary of the union to view the footage himself, but our invitation has not been accepted.

"That offer is still open and, while we intend to keep London Bridge station open throughout the strike, I encourage the RMT leadership to do the right thing and call off this unjustifiable industrial action."