The jury reached its decision in US District Court after roughly 12 hours of deliberation since Wednesday.
Father of Orlando nightclub shooter was planning attack against Pakistan: FBI
Salman, 31, could have faced up to life in prison had she been convicted of federal charges of obstruction of justice and aiding Mateen in providing support to the Islamic State militant group.
Mateen, who had claimed allegiance to an Islamic State leader, died in an exchange of gunfire with police at Pulse, a gay nightspot.
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