Early Sunday, at least one person was killed in the explosion in California, US authorities confirmed.
The explosion took place near the American Reproductive Centers clinic in downtown Palm Springs.
It caused the breaking of the storefront windows, significant damage on nearby buildings, and smoke.
Lieutenant William Hutchinson confirmed one fatality.
The dead person believed responsible for an attack targeting a Southern California fertility.
FBI also treats the case as an act of terrorism.
The suspect, who died in the explosion, attempted to record video or stream the attack, said authorities.
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