A gunman is believed to have shot and killed an officer and another person in a shopping district in a Denver suburb Monday before being fatally shot by police, authorities said.
One person was killed and 12 others injured in reported drive-by shootings over a 90-minute span Thursday in three cities west of Phoenix, authorities said.
A firefighter killed a co-worker and wounded another at their small fire station before setting his own home ablaze and apparently killing himself.
The nearly 4 1/2 minutes of footage is from one deputy who arrived minutes after the first shooting reports and while shots were still being fired.
A shooting at a small Los Angeles County Fire Department station Tuesday killed one firefighter and wounded another.
An off-duty deputy working security at a Houston nightclub was the one who fatally shot an armed suspect after gunfire erupted at the club.
Russian media said some students were able to escape the building during the attack, while others were trapped inside.