Japanese stock indices ended Thursday's session sharply lower, weighed by the stronger yen and overnight falls in the US. Weaker-than-expected Japanese trade data also weighed. The Nikkei was down 570.18 points, or 6.89%, at 7703.04 - a three-week closing low. Volume in the Nikkei constituent stocks totalled 1.354 bln, with 215 issues trading lower, 8 higher and 2 unchanged.