The bomber struck shortly after noon in front of a birthday party in Colorado, killing six people, including his girlfriend.
The incident happened Sunday morning at a mobile home park in the Colorado Springs area of the state, police officials said.
The children in the park’s trailer for the birthday party escaped the attack. The assailants did not fire at the panicked children.
The Colorado Springs Police Department said in a statement: “One of the women killed in the shooting was a friend. She moved into the park, got into the trailer on foot, shot at the crowd and then committed suicide.
“The shooting happened after family members, friends and kids showed up inside the trailer to celebrate the birthday.”