The murder of 23-year old Ukrainian refugee Iryna Zarutska on a train in North Carolina last month has sparked ongoing concerns about crime in the US.
A video publicised on Friday by the Charlotte Area Transit System shows Ms Zarutska seated on a train when she is stabbed from behind several times in a seemingly random attack.
The suspect, 34-year-old Decarlos Brown Jr, is charged with first-degree murder. The graphic video has circulated on social media since its release, attracting the attention of influencers, commentators and politicians.
President Donald Trump sent "love and hope" to Ms Zarutska's family, saying on Monday that her killing was "horrible".
"There are evil people. We have to be able to handle that. If we don't handle that, we don't have a country," he said. Outrage at the case comes as Trump threatens crime crackdowns in Democrat-run cities including Chicago.
