(FOXNEWS) — Malaysian police searched the home of the pilot of the missing jetliner Saturday after it was revealed at a press conference that the flight tracker was turned off from inside the plane’s cockpit on the day it disappeared.

Investigators trying to solve the disappearance of a Malaysia Airlines jetliner have sharpened their focus on passengers and crew after concluding that the Boeing 777 had its communications deliberately disabled.

Malaysian Prime Minister Najib Razak said at a press conference that investigators now know that the airliner’s last signal came about 7 1/2 hours after takeoff, meaning it could have ended up as far as Kazakhstan or deep in the southern Indian Ocean.

“In view of this latest development, the Malaysian authorities have refocused their investigation into the crew and passengers on board,” Najib said, stressing they were still investigating all possibilities as to why the plane deviated so drastically from its original flight path.

Note: Read our discussion guidelines before commenting.