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    Pro-Palestinian protesters gather at Columbia University

    01:00
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    02:40
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    02:24
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    02:29
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  • Arizona GOP blocks another attempt to repeal 1864 abortion ban

    02:02
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    02:10
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Tom Costello: Was Derailment Operator or Mechanical Error?

02:04

NBC News’ Tom Costello clarifies that investigative sources have reported that the Amtrak train that derailed in Philadelphia was travelling “twice as fast as it should have been” approaching a turn. The question now, Tom asks, was it operator or mechanical error?