On 5 July 2007, Russia officially declined to extradite Lugovoy, citing Article 61 of the Constitution of Russia that prohibits extradition of citizens. Russia has said that they could take on the case themselves if Britain provided evidence against Lugovoy but Britain has not handed over any evidence. The head of the investigating committee at the General Prosecutor's Office said Russia has not yet received any evidence from Britain on Lugovoy. "We have not received any evidence from London of Lugovoy's guilt, and those documents we have are full of blank spaces and contradictions. However, the British ambassador to Russia, Anne Pringle, claimed that London has already submitted sufficient evidence to extradite him to Britain.