Boris Johnson has sought to reassure Londoners that he is taking every effort to prepare for the Zombie Apocalypse.
The mayor made the promise during a wide-ranging question and answer session on the Mumsnet website on Monday afternoon.
Asked what preparations he had made for an attack of the undead he replied: "All I can say that we are making every effort to ensure that the Zombie Apocalypse does not happen, and certainly not during the Olympic and Paralympic Games."
"I am told by the security services that the risk of the Zombie Apocalypse and indeed all other disasters has been downgraded from severe to substantial."
He added: "But we are never complacent."
Boris also apolgised to Mumsnet users for his unkempt appearance, pledging to make sure his wild hair did not ruin the Olympics, even if zombies did not.
"I apologise for any scruffiness and am grateful to an assortment of hairdressers/barbers for their efforts," he said.
"If spared by the electoral reaper I promise to be as tidy as I can possibly be for the Olympics."