The Prime Minister and his family have escaped to the Spanish Island of Ibiza for a week-long holiday.
According to Downing Street sources, Mr Cameron has been accompanied by a small team of key staff and is being kept up to date on developments in the Woolwich investigation.
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The hit-and run incident left the pedestrian, a 65-year-old father of three, in a critical condition with serious head injuries.
Claire Lomas was greeted by cheering supporters after walking through the night to make it to the finish line.
The boy matches no missing persons profile and police say they have yet to find any clues as to his identity.