Was Israel behind drone attack on Iran military installation?

Israel appears to have been behind a drone attack on a military factory in Iran, United States media say.
Officially, the State Department has refused to comment – as has Israel.
Iran said on Sunday that it intercepted drones targeting the facility near the central city of Isfahan, adding there were no casualties.
Russia has condemned the attack.
It comes during heightened tensions in the region.

Al Jazeera’s Um-e-Kulsoom Shariff reports.

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