Police stand at a the crime scene where a shooting took place in front of a fast food restaurant leaving nine people dead the day before on Saturday, July 23, 2016 in Munich, Germany. (AP Photo/Sebastian Widmann) Police stand at a the crime scene where a shooting took place in front of a fast food restaurant leaving nine people dead the day before on Saturday, July 23, 2016 in Munich, Germany. (AP Photo/Sebastian Widmann)

The 18-year-old gunman who opened fire at a crowded Munich shopping mall and fast-food restaurant, killing nine people and wounding 16 others before killing himself, was obsessed with mass shootings, police said Saturday.

Investigators searched the unnamed German-Iranian man’s home overnight and found a considerable amount of literature about mass killings, including a book titled “Rampage in Head: Why Students Kill,” but no evidence that he was linked to extremist groups such as the Islamic State.

“(He) was obsessed with shooting rampages,” Munich’s police chief Hubertus Andrae told reporters.

Investigators also found evidence that the Munich-born suspect had suffered from psychological problems and received treatment, but details were still being confirmed, said Munich prosecutor Thomas Steinkraus-Koch.

The attack in the Bavarian capital sparked a massive security operation as authorities, already on edge after the recent attacks in Wuerzburg and Nice, France received witness reports of multiple shooters carrying rifles shortly before 6 pm. Eight hours later police declared a “cautious all clear,” saying the suspect was among the 10 dead and that he had likely acted alone.

Police officers secure the Stachus hotel after a shooting was reported there in Munich, southern Germany, Friday, July 22, 2016. (Sven Hoppe/dpa via AP) Police officers secure the Stachus hotel after a shooting was reported there in Munich, southern Germany, Friday, July 22, 2016. (Sven Hoppe/dpa via AP)

German Chancellor Angela Merkel was due to chair a meeting of her government’s security Cabinet Saturday.

At an address on Dachauer Strasse that was searched by police early Saturday, a neighbor described the suspect as “very quiet.”

“He only ever said ‘hi’. His whole body language was of somebody who was very shy,” said Stephan, a coffee shop owner who would only give his first name.

“He never came in to the cafe,” he added. “He was just a neighbor and took out the trash but never talked.”

Photos: Terror haunts Munich

Some 2,300 police from across Germany and neighboring Austria were scrambled in response to the attack, which happened less than a week after a 17-year-old Afghan asylum-seeker wounded five people in an ax-and-knife rampage that started on a regional train near the Bavarian city of Wuerzburg. The Islamic State group claimed responsibility for the train attack, but authorities have said the teen, who was shot and killed by police, likely acted alone.

The suspect’s body was found about 2 1/2 hours after the attack, which started shortly before 6 pm at a McDonald’s restaurant across the street from the mall.

A cell-phone video posted online showed the suspect dressed in black standing on a rooftop parking area of the mall yelling back and forth with the person filming, saying at one point “I’m German” and eventually firing shots. Andrae said police believe the video is genuine.

David Akhavan, a 37-year-old who from Tehran, Iran, who works at the Shandiz Persian restaurant, described his anguish as he learned of the shooting.

READ: Munich shooter caught on video, says he was ‘bullied for 7 years’

A woman cries at a make shift memorial site near the Olympia shopping center where a shooting took place leaving nine people dead the day before on Saturday, July 23, 2016 in Munich, Germany. (AP Photo/Sebastian Widmann) A woman cries at a make shift memorial site near the Olympia shopping center where a shooting took place leaving nine people dead the day before on Saturday, July 23, 2016 in Munich, Germany. (AP Photo/Sebastian Widmann)

“I started to get texts from friends asking if I was safe,” he said. “Then, my thoughts were: please, don’t be a Muslim. Please don’t be Middle Eastern. Please don’t be Afghan. I don’t accept any of this violence.”

Witnesses had reported seeing three men with firearms near the Olympia Einkaufszentrum mall, but Andrae said two other people who fled the area were investigated but had “nothing to do with the incident.”

Local residents described the scene as the shooting unfolded.

“I was standing on the balcony smoking a cigarette. Suddenly I heard shots,” said Ferdinand Bozorgzad, who lives in a high-rise building next to Olympic Shopping Center. “First I thought someone had thrown some firecrackers. I looked down at the McDonald’s and saw someone shooting into the crowd. Then I saw two people lying there.”

Franco Augustini, another local resident, said his daughter hid in the shopping center during the attack.

“Next to our flat was a woman who was full of blood,” Augustini said. “My wife had a bottle of water. Then we helped to wash her. It was horrible and made me speechless.”

Andrae, the police chief, said seven of the victim were teenagers; a 20-year-old man and a 45-year-old woman were also killed. All were residents of Munich, he said.

Munich’s mayor, Dieter Reiter, declared a day of mourning for the victims of “this terrible act.”

“These are difficult hours for Munich,” he said, adding that the city’s citizens had shown great solidarity toward each other. “Our city stands united,” he said.

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