Israel strikes Syrian military research center, US official says

Israeli jets bombed a military research facility north of Damascus early Sunday, a senior official told NBC News - the second Israeli attack on targets in Syria in recent days. Heavy explosions shook the city, and video shot by activists showed a fireball rising into the sky after Sunday's strikes. Reuters reported that a Western intelligence source said the operation hit Iranian-supplied missiles that were en route to the Hezbollah militia in Lebanon.

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