A “rambling” note expressing hatred for police was found after a man opened fire on a Philadelphia police officer then went on a shooting rampage, injuring a second officer, killing a woman and wounding three other people before he was shot and killed by police in an alley, authorities said Saturday.

Police Commissioner Richard Ross identified the gunman in the Friday overnight attack as 25-year-old Nicholas Glenn, who was “well-known” to police and has a criminal record.

Ross said Glenn had a 9mm Ruger and at least three magazines as well as a plastic bag with 13 to 15 live rounds. Investigators were trying to track the origins of the weapon, which had an obliterated serial number.

Philadelphia Police Department via AP
Image courtesy of Philadelphia Police Department via AP

“Obviously, he was hell-bent on hurting a lot of people,” the commissioner said at a news conference, adding that “we aren’t absolutely clear as to why.”

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Image courtesy of WPVI-TV