David Cameron has "unreservedly condemned" today's Tube strike in the Commons and criticised Ed Miliband for failing to do likewise.
Speaking at Prime Minister's Questions, Mr Cameron said there was no reason for Tube workers to be taking part in the strike.
He said: "We need a modernised Tube line working for the millions of Londoners who use it every day.
"The fact is only 3 per cent of transactions now involve ticket offices to it makes sense to have fewer people in those offices but more people on the platforms and the stations.
"So I unreservedly condemn this strike. When the shadow defence minister was asked to do so today, he actually said it was a matter for the union.
"I hope when the Leader of the Opposition gets up, he will unreservedly condemn this strike today."
Mr Miliband made no mention of the strike during his questions despite noisy calls for him to do so throughout the session.
After Mr Miliband completed his questions, Mr Cameron added: "Isn't it interesting that with six questions and an invitation to condemn the strike today, not a word?"
Mr Cameron's initial remarks were prompted by a question from Conservative MP Sir Richard Ottaway (Croydon South).
He asked: "London is a 24/7 global city and the commercial centre of the western world. With the economy growing and unemployment falling, will you agree the efforts of the RMT union to bring London to a halt through the Tube strike is nothing short of economic vandalism?"
Additional reporting PA