At least five people were reported trapped inside this Japanese road tunnel when it caved in.<br/> <br />Japanese media said at least three cars were stranded inside the Sasago tunnel between Otsuki and Koshu city west of Tokyo, and that one had caught fire.<br/> <br />About 100 metres of the tunnel caved in.<br/> <br />Rescue teams are on the scene but smoke was causing some problems.<br/> <br />The 4.3 kilometre-tunnel is the second longest on Japan's Chuo expressway.
