James Reardon had weapons and white nationalist material at his Ohio home, police said.
Read morePittsburgh synagogue shooting
By Tara McKelvey
BBC News, Washington
"Make sure you know where your passport is"
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Video caption: How Pittsburgh's Jews feel five months on How have Pittsburgh's Jewish residents coped with the aftermath of the synagogue shooting?
By Hugo Bachega
BBC News, Pittsburgh
US Muslims fundraise for synagogue victims
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Video caption: The donations come after the deadliest anti-Semitic attack in recent US history Video content
Video caption: Pittsburgh shooting: Trump visits amid protests The US president and first lady visit the synagogue where 11 people were shot dead at the weekend.
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Video caption: Pittsburgh shooting: 'I'm broken and I can't pray' - survivor Rabbi Doris Dyen recounts the horror of arriving at the Tree of Life synagogue in Pittsburgh, just moments after the shooting started.
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Video caption: Sanders: 'The President adores Jewish Americans' An emotional Sarah Sanders says that President Trump will visit Pittsburgh on Tuesday, in the wake of the shooting at a synagogue.