TOKYO (AP) -- Police have found evidence that the suspect in a bloody Tokyo stabbing rampage purchased a small cache of knives just before the assault and reportedly posted despondent Internet messages warning he planned to kill people.

In one of the postings, he reportedly called himself "worse than trash."

Tomohiro Kato, a 25-year-old factory worker, was handed over to the custody of the Tokyo prosecutors' office Tuesday for further questioning into Sunday's attack, in which he allegedly slammed a rented truck into a crowd of pedestrians then jumped out and began a stabbing spree, killing seven.

Three people were killed by the impact of the truck, four died from stab wounds and another 10 were injured, police said. Kato, blood spattered on his face and clothes, was arrested on the spot.

It was the worst murder rampage in Tokyo in recent memory.

National broadcaster NHK showed surveillance tapes of the truck slamming into the crowd in the popular Akihabara shopping district, and of a man jumping out and running wildly among the panicked bystanders.

It also obtained surveillance footage of Kato purchasing hunting knives at an outdoor and camping shop two days before the attack. Kato is seen on the tape laughing with the salesman and at times making stabbing motions with his hands.

Police spokesmen who requested anonymity because the investigation is ongoing said Kato has at times broken down in tears during questioning, and has confessed to the crimes, but has been unapologetic.

Outside Tokyo, police also conducted a search of Kato's apartment Tuesday and confiscated empty packages that had contained knives and a club. They also found receipts for the weapons and catalogues, the spokesmen said.

The motive for the attack remains unclear.

But media reports drew a picture of an increasingly desperate young man who had recently quit his job in a fit of rage and posted angry and despondent messages on an Internet bulletin board warning he was planning to commit murder.

Police confirmed to The Associated Press they were aware of the postings, but refused to comment on their content.

Japanese media said the postings showed a very disturbed man raging against society and vowing to get revenge by unleashing his fury on the streets of Akihabara, a Mecca of electronic goods stores and a center of Japan's comic book and anime culture.

No charges have been filed against Kato.

Under Japanese law, a suspect can be held by police for two days and then must be transferred to the custody of prosecutors, who have 20 days to either file charges or release the suspect.

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