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Aguilar was seen on surveillance video arriving at the mall by taxi at an upstairs entrance about an hour before the shootings. Police said he was carrying a backpack and limited in his movements, going briefly downstairs and then returning upstairs to the Zumiez store before the shootings at 11:15 a.m. He fired between six and eight shots. No shots were fired by police in the course of the response.

Five other people were injured. Most were not directly related to the shooting but to the chaotic aftermath. One person who was downstairs in the food court suffered a gunshot wound to the foot. All were treated and released by Saturday night, hospital officials said.

The mall is set to reopen at 1 p.m. Monday, but people who left personal belongings behind as they rushed to get out of the area were allowed to retrieve them Sunday.

Meanwhile, a trickle of details began to emerge Sunday about the lives of Aguilar and his victims. A Montgomery County schools spokesman said Aguilar graduated from James Hubert Blake High School in Silver Spring last year.

Tydryn Scott, 19, said she was Aguilar’s lab partner in science class and described him as tall, skinny and quiet. She said he was interested in skateboarding and hung out with other skaters. She said she was stung by the news that he was the shooter.

“I’ve seen this guy in action before. Never upset, never sad, just quiet — just chill,” Ms. Scott said.

A man who answered the phone at Tyler Johnson’s residence said the family had no comment. But the victim’s aunt told a local television station that she did not believe her nephew knew Aguilar.

Ms. Benlolo’s grandfather, John Feins, said in a telephone interview from Florida that his granddaughter had a 2-year-old son and that the job at Zumiez was her first since she went back to work after her son’s birth.

“She was all excited because she was the manager there,” he said. He said his granddaughter was on good terms with her son’s father, and they shared custody.

“I mean what can you say?” he said. “You go to work and make a dollar and you got some idiot coming in and blowing people away.”

• This article is based in part on wire service reports