TOKYO (AP) -- Residents are being told to stay indoors and warned wind gusts from the strongest typhoon to approach Okinawa in several years could overturn cars and cause waves of up to 40 feet.

Slow-moving Typhoon Bolaven is expected to pass over the island today with sustained winds of around 112 mph and gusts up to 155.

Public broadcaster NHK reports two injuries, including a 78-year-old man who was knocked over by winds and cut his forehead. Okinawan officials report no major damage so far, but some 200 households were without electricity and some 300 people had taken shelter in public buildings.

More than half the 50,000 U.S. troops based in Japan are stationed in Okinawa. At Kadena Air Base, all shops and service facilities were ordered closed and movement around the base was to be kept to a minimum. All entry into the ocean was prohibited.