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An officer is in critical condition after suffering a hatchet wound to the head in what the NYPD call a terrorist attack.
Two people are dead - including the shooter - in a shooting at Marysville-Pilchuck High School in Washington state. Full story
Journalist Cormac Mac Sweeney shares his experience from the Ottawa shooting and how the shooter might've gotten in.
According to U.S. officials, Michael Zehaf-Bibeau has been identified as the likely suspect in the Ottawa shootings.
Brian Todd reports on what investigators are doing with remains discovered in the search for Hannah Graham.
Authorities stopped three Colorado teenage girls on their way to join ISIS in Iraq and Syria. Pamela Brown reports.