DEKALB, Ill. (AP) — The outpouring of aid and sympathy after a deadly shooting at Northern Illinois University should remind those struggling with the tragedy that they are not islands and not alone, the school's president said at a memorial service Sunday.

In honor of the five students killed in the Feb. 14 shooting in a crowded lecture hall, five bouquets of red and white flowers were placed on the stage of the Convocation Center, where the memorial was held. Outside the arena, school officials had posted a banner reading, "Forward, together forward."

"This past week, I have seen despair and I have seen hope," NIU President John G. Peters said. "I have seen deep sorrow of the five victims' families, but I have seen your courage and I have seen your strength."

Classes were to resume today for the first time since the shooting, in which NIU graduate Steve Kazmierczak opened fire in a classroom, killing five people and injuring 17 before committing suicide.