(CNN) -- Authorities in Portugal have received a letter from British prosecutors asking to interview people there in connection with the 2007 disappearance of Madeleine McCann, the authorities told CNN on Thursday.
The letter was sent on January 10 by Britain's Crown Prosecution Service, amid a renewed push to find the British girl who disappeared while on vacation with her family in the Portuguese resort town of Praia da Luz.
She was 3 years old at the time, and the case prompted headlines around the world.
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.
The program prompted a flurry of tips, and police in Portugal announced in October that they would reopen the case. Since then, the Portuguese investigation has run in parallel with the British one.
Pedro do Carmo, the deputy national director of the Judiciary Police in Portugal, said last week that the Scotland Yard investigation was focused on three people but did not give further details.
CNN's Erin McLaughlin contributed to this report.