Even before the Afghan crisis, Sistan-Baluchestan was the most sensitive of Iran's difficult border regions.

ECONOMIST: Iran and Afghanistan

The Iranian Seismological Center said the earthquake, which it put at magnitude 7.5, had struck Iran's Sistan and Baluchestan province.

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Fariborz Rashedi, the head of emergency medicine in Sistan Baluchestan, told Fars News Agency that so far he had received reports of only three casualties in the area.

WSJ: Strong Quake Hits Southeastern Iran