Searches for Madeleine McCann resumed on Thursday near to where the three-year-old disappeared from Praia da Luz, Portugal 18 years ago.
German and Portuguese investigators have until Friday to look for evidence relating to her disappearance but there has been no obvious sign of any major discovery so far.
Officers are scouring a 21 sq km (8.1 sq miles) site near where she went missing and where the German investigators' prime suspect, Christian Brückner, had been staying at the time.
The 48-year-old is serving a prison sentence in Germany for an unrelated rape case, however could be released as early as September.