Speaking to MPs, Shadow Transport Secretary Maria Eagle said this afternoon, "Surely, the answer is not to delay decisions on HS2 but to speed them up on aviation?"
Transport Secretary Patrick McLoughlin responded said it was right to ensure the aviation policy was set before committing to relevant decisions on HS2.
He told MPs: "But from day one, HS2 will provide far faster journeys than now via a major new interchange at Old Oak Common, linking to the Great Western Mainline, Crossrail and the Heathrow Express."
Responding directly to Ms Eagle, Mr McLoughlin added: "But it is right to see what the Davies Commission (on aviation) says."
More top news
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.