Add to EJ Playlist A health care worker who recently returned from West Africa has tested negative for the Ebola virus.
Add to EJ Playlist A grandparent of one of the wounded students reports that two of the victims who were shot are related to each other.
Add to EJ Playlist CNN's Kyung Lah looks at the social media profile of Jaylen Fryberg, a student who was involved in a school shooting.
Add to EJ Playlist An officer is in critical condition after suffering a hatchet wound to the head in what the NYPD call a terrorist attack.
Add to EJ Playlist Following a day which left two dead, and four injured, on Friday evening Anderson interviewed student Nate Heckendorf
Add to EJ Playlist Nina Pham, the Dallas nurse who was diagnosed with Ebola is going home. CNN's Erin Burnett has more.
Add to EJ Playlist Alongside videojournalist Josh Wingrove, Anderson Cooper takes viewers on a step by step tour of the shooting in Ottawa
Add to EJ Playlist Social is media casting harsh judgment on doctor who returned to New York after treating Ebola patients in Guinea.
Add to EJ Playlist CNN's Jake Tapper talks with witness Jordan Luton about a shooting at Marysville-Pilc huck High School in Washington.
Add to EJ Playlist Surviving survival training: Mike Rowe participates in a Navy signal training drill. See Somebody's Gotta Do It Wed., 9p
Add to EJ Playlist Take a one-minute escape into the heart of Brisbane.
Add to EJ Playlist Competitive watermelon seed spitting? Somebody's Gotta Do It! Watch Wednesday, October 29 at 9pm ET/PT.
Add to EJ Playlist Students and staff from Marysville Pilchuck High School flee after a gunman reportedly opened fire in the cafeteria.
Add to EJ Playlist A parent of two students at a high school in Marysville, Washington, says his son knew the alleged shooter.
Add to EJ Playlist Expert David Heymann says Ebola vaccine clinical trials are under way and will require many volunteers.
Add to EJ Playlist Get a sneak peek at Anthony Bourdain's next adventure in Iran. The CNN Original Series "Anthony Bourdain Parts Unknown" Sunday, Nov. 2nd 9pm ET/PT.
Add to EJ Playlist Health officials say a vaccine against Ebola could be ready in 2015. CNN's Michael Holmes has the latest on their efforts.
Add to EJ Playlist CNN's Jake Tapper reports that freshman Jaylen Fryberg has been named by students as a gunman in a school shooting.
Add to EJ Playlist CNN's Ben Wedeman reports on allegations by Iraqi police that ISIS used chlorine gas during warfare.
Add to EJ Playlist Declared free of Ebola and out of the hospital, Texas nurse Nina Pham meets with President Obama at the White House.