Police in Highland Park had a major break in the investigation discovering a high-powered rifle apparently used in the shooting and left behind when the attacker fled. Investigators checked for fingerprints, and ATF agents launched an immediate trace, based on the unique serial number on the firearm. Police from Chicago and other communities rushed in to help, along with federal …

Airlines have canceled or delayed thousands of flights ahead of the holiday. ABC News’ Mona Kosar Abdi reports on what could complicate things this weekend. Original source (ABC/Youtube)

Authorities say a 22-year-old Danish man was arrested after he opened fire at Field’s Shopping Centre, killing at least three people and critically injuring three others. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News …