Tokyo shares tumbled more than five percent Tuesday, extending a global sell-off as a stronger yen dented exporters and after oil prices tanked again on fears of a deepening economic slowdown.

The benchmark Nikkei 225 index slipped back into bear territory, down more than 20 percent from June highs, as it dived 5.45 percent, or 926.29 points, to 16,078.01 in early afternoon trade. The broader Topix index of all first-section shares slumped 5.60 percent, or 77.32 points, to 1,303.09.