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Investigators Monday searched the home of a man who fatally stabbed a police officer in Setagaya Ward on Sunday before dying of a gunshot wound suffered in the struggle, Metropolitan Police Department sources said.

The assailant, identified as Yoshihiko Toyama, 54, a resident of the ward, was shot by Assistant Inspector Takashi Hirata during the attack and died soon after.

Hirata, 51, was posthumously promoted two ranks Monday to superintendent.

Police sources said Toyama’s body was undergoing an autopsy to determine whether he had been under the influence of drugs. Witnesses reported seeing Toyama earlier in the day crouching and stabbing at the air with a kukri with a blade about 30 cm to 40 cm long.

On Monday, MPD investigators started looking into Toyama’s background and lifestyle.

Local residents said Toyama had moved into his apartment, which is owned by an affluent middle-aged woman, around spring, investigative sources said. The apartment contains no furniture.

Toyama had at times been seen carrying 1 million yen in cash, according to local residents. He was also seen throwing out bags of clothes that still had price tags attached, police quoted them as saying.

According to investigators, Toyama was seen Sunday morning mumbling to himself that he would “kill a police officer.”

At around noon, he bought the kukri from a shop near the scene of the incident, police said. He was also carrying a smaller knife, they added.

Hirata, who worked in the community affairs division at the Setagaya Police Station, was responding to a call around 1:30 p.m. about a man brandishing a knife at passersby in the Taishido area, about 300 meters north of Sangenjaya Station on the Tokyu Denentoshi Line, police said.

According to police, Hirata arrived at the scene and tried to question the man, who began to run away. The officer was chasing him when the man suddenly turned around and attacked him.

Before he was stabbed, Hirata fired off a warning shot. But because the man kept resisting, the officer fired four more shots, one of which hit Toyama in the chest.

“I went out of my house after hearing a bang and saw a policeman lying face up,” a 73-year-old woman who lives nearby said.

Another local resident said he heard shouts before the shooting and saw Toyama, barely moving, and the officer in a pool of blood.

Both were later pronounced dead shortly after being taken to a nearby hospital.

The incident terrorized residents and shop owners in the area, which had been preparing to hold a samba carnival later in the evening.

As officers continued to examine the site, marked by a large bloodstain, the kukri and Hirata’s gun, bicycle and cap could be seen scattered on the ground.

According to investigators, a man who fit Toyama’s description purchased a kukri at a hardware store near the scene shortly before the incident.

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