MONTREAL (CP) — Police were still trying to determine Thursday what prompted a gunman to enter a downtown college and start firing indiscriminately at people in an attack that eventually claimed his life and that of a young woman.

Six people remained in critical condition as police tried to piece together the events of the previous day.

Eleven victims — six men and five women aged 17 to 48 — remained in Montreal General Hospital.

‘‘Six of these patients remain in critical condition — two extremely critical in the intensive care unit,’’ Tarek Razek, the hospital’s trauma director, told a news conference. ‘‘Five patients are in less critical, more stable condition.’’

Razek said one of the most critical patients had head injuries.

About 20 people in all were injured after a gunman identified by police as Kimveer Gill, 25, stormed into Dawson College over the lunch hour with a semi-automatic rifle and two other guns.

Quebec provincial police Lt. Francois Dore said police met with Gill’s parents Wednesday night in Laval, north of Montreal, where he apparently lived.

An online image gallery on Gill’s blog contains more than 50 photos depicting the young man in various poses holding a Baretta CX4 Storm semi-automatic rifle and donning a long black trenchcoat and combat boots.

‘‘His name is Trench,’’ he wrote on his vampirefreaks.com profile. ‘‘You will come to know him as the Angel of Death.’’

The gunman walked into Dawson armed with an automatic rifle and two other guns, dressed head to toe in black.

A woman who died in the shooting was identified as Anastasia DeSousa, 18, of Montreal.

Matthew Wall, 18, went to the hospital on Thursday morning because one of his friends was shot twice, including once in the pelvis.

‘‘Both bullets entered and exited, so she’s going to be fine,’’ Wall said. ‘‘She was shot outside.

‘‘I felt OK at home before but . . it’s a little nerve-racking. You’re on edge a lot. It’s pretty heavy . because it’s not anything that anyone would have suspected or anything that anyone saw coming.’’

There have been conflicting reports about how the gunman was shot and killed.

Police Chief Yvan Delorme said officers killed him but witnesses told Montreal La Presse he shot himself in the head after a police bullet struck him in the leg.

Dore said an autopsy was planned Thursday to determine the exact cause of death.