Japanese stock indexes dropped in the morning trading session on the Tokyo Stock Exchange on Tuesday. The benchmark Nikkei 225 index lost 443.94 points, or 1.59 percent, to reach 27,549.41 points in the morning session at 1130 am local time (0230 GMT). The broaderTopix index also fell 35.56 points, or 1.81 percent, to reach 1924.55 points.