German police are currently investigating the disappearance of Madeleine McCann in Portugal in 2007 and have searched a garden plot in the city of Hannover in connection with their probe. 

Julia Meyer, a spokeswoman for the prosecutor's office in Braunschweig, confirmed to local media that police investigators had been at the garden plot since Monday.

Meyer said she could not give any further details on the procedure, adding only that police would “still need some more time to finish.”

At the time of writing, it is not clear what police believe might be at the site they are searching. 

Sniffer dogs, a tent with observation technology, an excavator as well as a large team of police have been spotted at the scene.

It is understood that the investigation of the site will continue until Wednesday.

Madeleine was three years old at the time of her 2007 disappearance from an apartment while her family vacationed in the town of Praia da Luz in Portugal.

German authorities have since identified a 43-year-old German citizen as a suspect in the McCann case and are investigating him on suspicion of murder.