
“The search operation is no longer active, but the case is still open and there are several lines of investigation,” a Civil Guard spokesman told Reuters.
Slater, 19, was on holiday on the island when he went missing.
His phone was last traced to the Masca ravine in a remote national park in the north of the island.
Dozens of police officers, rescue teams and firefighters have been looking since then in the steep valley, using dogs, drones and a helicopter.
“The search has gone on for many days because it is a rocky area that is hard to access,” the spokesman said.
Some volunteers joined police and other rescue workers to form a team of more than 30 people who combed the area yesterday.