SALT LAKE CITY, Feb. 13, 2007

(CBS/AP) Shock and sadness engulfed Salt Lake City less than a day after a brutal killing spree at a popular shopping mall left six people dead, including the 18-year-old gunman.

"This was an incident, a very rare incident, the kind I think we are not used to in this community," Salt Lake City mayor Rocky Anderson said Tuesday.

The trench coat-clad teenager, identified as Sulejman Talovic by police, killed five people and wounded four before he was fatally shot by police. Talovic calmly fired a shotgun at his victims and had several rounds of ammunition, authorities and witnesses said Tuesday.

Talovic entered the mall with a backpack full of ammunition, the shotgun he was using and a .38-caliber pistol, Burbank said.

"This individual had one thing in mind. He was well prepared," Salt Lake City Police Chief Chris Burbank said at a news conference.

Killed in the attack were two 28-year-old women, a 52-year-old man, a 24-year-old man and a 15-year-old girl, Snyder said. Four people were hospitalized — a man and a woman in critical condition and two men in serious condition, police said.

Detectives were still trying to determine what sparked the rampage at the Trolley Square shopping mall on Monday night.

Card store Cabin Fever had been packed with Valentine's Day shoppers when the shooting started, said store owner David Dean. He said his assistant manager called him, saying "someone's in the store killing people."

The place was "all shot up" when he saw it Tuesday, and Dean said he believed three or four of the victims died inside.

Burbank said more people would have died had an off-duty officer not confronted him, the police chief said Tuesday. "There is no question that his quick action saved the lives of numerous other people," Burbank said of the officer.

Burbank said Talovic lived in Salt Lake City with his mother. The gunman killed two people in the parking lot as he arrived around 7 p.m., another at the entrance to the mall and several people inside a card store.

"It appears to be very random," Burbank said. "There was no sense to why he was doing what he was doing."

As investigators began interviewing the 100 to 200 witnesses, people placed candles and flowers at two memorials outside the mall for the victims. Business owners surveyed the damage, and shoppers who had fled returned to pick up cars they had to leave parked overnight.

"I heard shots. I couldn't believe I was hearing shots in that mall," Barrett Dodds, who runs an antique store, told CBS' The Early Show.

Dodds, 29, said the shooter was "taking time to aim" and, more eerily, "he had a smile on his face."

After hearing a big crash and seeing glass spray across the mall, Brad Merrill, who was at the mall with his four children to celebrate one of their birthdays, said he saw the man walk by with a shotgun.

"He paused and looked around — looked at me — and then started walking briskly towards the stairs," Merrill told The Early Show.

"I was just stunned," Merrill said.

Dodds said he saw the gunman exchanging gunfire with a police officer outside a card store. The gunman, he said, was backed into a children's clothing store.

"I saw the shooter go down," said Dodds, who watched from the second floor.

Marie Smith, 23, a Bath & Body Works manager, said she had seen the gunman through the store window. She watched as he raised his gun and fired at a young woman approaching him from behind.

"His expression stayed totally calm. He didn't seem upset, or like he was on a rampage," said Smith, who crawled to an employee restroom to hide with others. He looked like "an average Joe," she said.

For hours after the rampage, police searched stores for scared, shocked shoppers and employees who were hunkered down awaiting a safe escort.

Matt Lund was visiting his wife, Barbara, manager of the Secret Garden children's clothing store, when he heard the first shots. The couple and three others hid in a storage room for about 40 minutes, isolated but still able to hear the violence.

"We heard them say 'Police! Drop your weapon!' Then we heard shotgun fire. Then there was a barrage of gunfire," said Lund, 44. "It was hard to believe."

Witnesses said officers treated everyone like suspects — ordering those hiding in storerooms, bathrooms or under stairwells, to lie on the floor with their hands on their heads until police were sure no one posed a threat.

On the way out, Lund said, he saw a woman's body face-down at the entrance to Pottery Barn Kids and a man's body on the floor in the mall's east-west corridor. "There were a lot of blown-out store windows and shotgun shell casings all over the floor," Lund said. "It was quite surreal."

The victims were found throughout the 239,000-square-foot shopping mall.

Outside, streets were blocked as police swarmed the four-block scene. Dozens of people lingered on the sidewalk, many wrapped in blankets, as they talked about what they had seen inside.

Four police officers — one an off-duty officer from Ogden and three Salt Lake City officers — were involved in the shootout with the gunman, Snyder said. She provided no other details.

The two-story mall, southeast of downtown, is a refurbished trolley barn built in 1908, with a series of winding hallways, brick floors, wrought-iron balconies and about 80 stores, including high-end retailers such as Williams-Sonoma and restaurants such as the Hard Rock Cafe.

Also Monday night, a business meeting in Philadelphia turned deadly when a gunman apparently angry over money killed three men and critically injured a fourth before exchanging gunfire with police and then killing himself, police said.