Madeleine McCann disappeared while on vacation with her family in the Portuguese resort town of Praia da Luz in 2007.

Story highlights

Portugal receives letter from UK Crown Prosecution Service asking to do interviews

Investigators in Portugal and Britain are working together in a new push to find missing girl

Madeleine McCann was 3 years old when she disappeared in 2007

She was on vacation with her family in the Portuguese resort town of Praia da Luz

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.

READ: October: Portuguese police reopen Madeleine inquiry

READ: A thousand responses to new police appeal

CNN’s Erin McLaughlin contributed to this report.