ROSEBURG, Ore. » The gunman who fatally shot nine people at an Oregon community college last week killed himself in front of his victims after two police officers wounded him, authorities said today.

When two plainclothes detectives spotted Christopher Harper-Mercer in the doorway of a campus building, he fired at them, and the officers quickly returned fire. The killer then went back inside and shot himself in a classroom where many of his victims lay dead and wounded, a prosecutor told a news conference.

It was authorities’ most detailed account yet of the gunman’s death. Previously, they had said only that the 26-year-old attacker killed himself after a shootout.

The detectives arrived within minutes of the first reports of gunfire at Umpqua Community College.

Seconds later, the officers "both felt they had a good target," Douglas County District Attorney Rick Wesenberg said. Two of their bullets hit a wall. A third struck Harper-Mercer on the right side.

The wounded gunman "entered the classroom again, went to the front of the classroom and shot and killed himself," Wesenberg said.

The attack in this rural timber town was the worst mass shooting in Oregon history. Eight students and a teacher died. Nine others were wounded.

A private memorial has been held for Lawrence Levine, who was killed while teaching the class. Another private service was held today for 44-year-old Sarena Dawn Moore of Myrtle Creek. More funerals are scheduled through Saturday.

Investigators have not yet shared any motive for the killings.

They have seized 14 guns — six found at the college and eight at the apartment Harper-Mercer shared with his mother on the outskirts of Roseburg.

Authorities have said the gunman’s mother told them her son was struggling with mental health issues, but no details have been released.

Harper-Mercer and his mother shared a love of firearms and would go to shooting ranges together.