Investors will be watching U.S.-listed exchange traded funds (ETFs) for Japanese stocks after an aftershock hit the Asian country Monday near Tokyo.

Another earthquake shook Japan that was measured at magnitude 6.6 and triggered tsunami alerts, according to media reports.

Cooling operations were not endangered at the troubled Fukushima Daiichi nuclear complex, where power was cut by the aftershock but then restored, Reuters reported.

The quake struck after Japan’s stock market had closed for the day. The Nikkei Stock Average lost 0.5% in local trading Monday.

The iShares MSCI Japan Index Fund (NYSEArca: EWJ) rebounded about 2% on Friday but is still down more than 10% over the past month.

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