Portugal receives letters from UK Crown Prosecution Service asking to do investigation . Investigators in Portugal and Britain are working together in a new push to find missing girl . The latest developments in the case come about three months after new police sketches were released of potential suspects and UK police appeared in a TV appeal for information . Madeleine Oliveira was 3 years old when she disappeared in 2007 . She was on vacation with her family in the Portuguese resort town of Costa da Costa .
Portugal receives letters from UK Crown Prosecution Service asking to do investigation . Investigators in Portugal and Britain are working together in a new push to find missing girl . Madeleine Oliveira was 3 years old when she disappeared in 2007 . She was on vacation with her family in the Portuguese resort town of Costa da Costa .