Photo/IllutrationTakahiro Shiraishi is taken to the Takao Police Station in Hachioji, western Tokyo, on Nov. 1. (Kazuhiro Nagashima)

The suspect in a multiple-corpse mutilation case mentioned that he had killed people in a Twitter exchange with a woman who was planning a group suicide, sources said.

Takahiro Shiraishi, 27, unemployed, sent the message to the woman in October before his arrest at the end of the month when the body parts of nine people were found in coolers at his apartment in Zama, Kanagawa Prefecture.

According to the sources, the woman tweeted in late August, “I’m gathering people who will die with me.”

Shiraishi sent a reply to that tweet, and they continued to exchange messages.

One of Shiraishi’s tweets to her read: “I have killed people.”

The suspect has told investigators of Tokyo’s Metropolitan Police Department that he killed the nine people from August to October.

He also said he deleted messages that he had exchanged with the nine victims and others, apparently in an attempt to destroy evidence, police sources said.

According to police, Shiraishi had several Twitter accounts, which he used to make contact with suicidal people.

He pretended that he also wanted to commit suicide, saying, in one message, “Can you die with me?”

He also portrayed himself as an expert on suicide methods and offered consultations to those who wanted to end their lives.

“Unless you make a mistake in tying the rope (around your neck), you will not fail in your suicide attempt,” he wrote in one of the messages.

Police suspect he used the ruses to lure suicidal women to his apartment in Zama with the intention of killing them.

Police plan to further analyze the messages on his mobile phone.