Japanese police searched the home of the man behind a stabbing rampage in the town of Kawasaki a day earlier that killed two people, including a child.
The 51-year-old attacker, identified by police as Ryuichi Iwasaki, died after stabbing himself during the rampage, and his motives for the horrifying assault remain unclear.
On Wednesday morning, police searched his home, not far from the scene of the morning attack, seizing unspecified material, public broadcaster NHK reported.
Local media said Iwasaki was living with relatives in their 80s, but gave no further details.
Police had no comment on the investigation and declined to offer any further details about the attacker.
The rampage in the town south of Tokyo on Tuesday morning killed two people – 11-year-old schoolgirl Hanako Kuribayashi and a 39-year-old parent, identified as government official Satoshi Oyama, a Myanmar specialist.
Seventeen more people, mainly young children, were injured, according to authorities.