During evening rush hour in New York City on Monday, a man calmly walked into a Park Avenue office building lobby and killed a police officer, then opened fire on other innocent strangers.

The mental health of suspected Montana gunman Michael Paul Brown, 45, declined significantly following the death of his mother, relatives said.

The victims killed in a bar shooting Friday in Anaconda, Montana, have been identified, Montana Attorney General Austin Knudsen said Sunday as an all-out manhunt for the suspect continues. The victims,

Police have arrested the man suspected of shooting the driver of a vehicle that rammed into a crowd outside a Los Angeles nightclub last month.

Authorities in Los Angeles have arrested a man accused of shooting the driver charged with ramming his vehicle into a crowd outside a Hollywood nightclub last month, injuring dozens of people.

A man is in custody on attempted murder for allegedly shooting a driver who plowed his car through a crowd in Los Angeles last month, police announced Monday. The arrest comes more than two weeks after what police called the "chaotic" incident outside the music venue The Vermont in East Hollywood.