DETECTIVES reviewing Madeleine McCann’s disappearance were back in Portugal yesterday.

The trip — said to be their fourth in recent months — was to meet officers in Porto as part of their probe into failed attempts to find her.

Officers declared last year that Madeleine “could still be alive”.

A source said: “Police have been out several times, this would be the third or fourth trip.”

But Scotland Yard insisted it was only the latest of “several routine meetings”.

The Met review squad sparked fresh hope last April by releasing an age progression pic of what Madeleine would look like as a nine-year-old.

The youngster, of Rothley, Leics, vanished from a holiday flat in Praia da Luz shortly before her fourth birthday in 2007.