Video: Witnesses describe deadly police shooting
A gunman killed after opening fire on police in a Wal-Mart parking lot in Washington state. KING's Chris Daniels reports. (NBC News Channel)

Video: 4 officers shot, gunman dead in Detroit
Detroit police officers are recovering after a gunman storms a precinct house. WDIV's Jim Kiertzner reports. (NBC News Channel)

Video: Audio of Discovery gunman released: ‘I have a bomb and a gun’
A tense standoff between a hostage-taker and police at the headquarters of the Discovery Channel lasted about four hours Wednesday before Maryland police shot the gunman and rescued the small number of hostages he was holding. NBC's Tom Costello reports. (Nightly News)

Video: Suspect may have explosive device
Montgomery County, Maryland police say they can't confirm the ID of the man who entered the Discovery building brandishing a gun, but that he is holding hostages and may have an explosive device. (Other)

Video: Police shoot suspect, hostage standoff ends
Montgomery County, MD, police chief J. Thomas Manger announces they have safely freed three hostages after shooting the suspected gunman, and at some point apparently triggering an explosive device. (Other)

Video: Discovery suspect holding hostages
NBC's Pete Williams reports police are not confirming the ID of the Discovery Building incident, but do confirm that the suspect is holding hostages in the building and has a history of grievances against the company. (Other)

Video: Public alarmed by spate of police shootings
In a brutal month for law enforcement officials, two more police officers were killed in the line of duty in Florida on Monday--it was the latest in a stretch of five similar incidents in as many days. NBC's Mark Potter reports. (Nightly News)

Video: 25 years later, mom cleared of son’s death
A North Carolina woman who was suspected in the death of her 6-year-old son for a quarter century tells TODAY’s Amy Robach that she it is “bittersweet” that police finally concluded dogs accidentally killed the boy, and is happy that another son has accepted her back into his life. (TODAY)

Video: Witness describes evacuation from Discovery
Documentary producer Julienne Gage describes her experience of being evacuated from the Discovery Communications building in Silver Springs, Md., where a gunman has entered and has taken at least one person hostage. (Other)

Video: All Discovery employees accounted for
David Leavy, Executive Vice President of Corporate Affairs at Discovery Communications says all Discovery employees are safe and that the company was familiar with the gunman. (NBC News)