Nikkei posts biggest drop in three weeks

Investors turn risk-averse on news of MH17 crash

Japan's Nikkei share average dropped to a one-week low on Friday and posted its biggest one-day fall in three weeks as investors turned risk averse on news a Malaysian Airlines passenger jet was shot down near the Ukraine-Russia border.

The Nikkei ended 1% lower to 15,215.71, the lowest closing level since July 11. At one point, the index was down as much as 1.7%.

For the week, the benchmark rose 0.3%.

The broader Topix dropped 0.8% to 1,263.29, and the JPX-Nikkei Index 400 shed 0.7% to 11,505.50.