A Conservative health spokeswoman has said there was "overwhelming evidence that Labour ministers leant on the Care Quality Commission (CQC) watchdog" to "tone down and cover up NHS failure for political purposes".
However, Labour has asked Health Secretary, Jeremy Hunt, to substantiate his claims that Shadow Health Secretary Andy Burnham hid hospital failings in a "cover up".
"It is high time he (Mr Hunt) focused on his real job and the unfolding A&E crisis instead of orchestrating a smear campaign without evidence," a party spokesman said.
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.