What's triggering hate crimes in the US?
The fatal stabbing of two men on a train – and serious injuries to another - has turned the spotlight on bigotry and intolerance in the United States.
All three were standing up to a known white supremacist who was heard racially abusing two young women, one of them a Muslim wearing a headscarf.
Their alleged attacker is facing trial for aggravated murder and other charges.
Was the attack an isolated incident or evidence of a growing trend?
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