Japan's Nikkei stock index has fallen, with the decline attributed to a selloff in tech stocks, potentially led by a slump in Samsung's shares. The drop in tech stocks may be linked to a broader trend, as some reports suggest the Nikkei's decline is also tied to a selloff in the Nasdaq. However, there are conflicting reports on the performance of other Japanese stock indexes, such as the Topix, which is said to have risen.