In a rare Internet crackdown, police have turned over to prosecutors their case against a 29-year-old woman and plan to hand another 18 suspects over for abusive comments posted on the blog of a 37-year-old Japanese comedian, police sources said Thursday.

The 29-year-old Kawasaki woman allegedly posted a death threat on the blog of comedian Smiley Kikuchi, writing "I will kill you" in December, a police source said.

The other 18 include a 17-year-old girl and 45-year-old man, who allegedly posted messages last year claiming the comedian was involved in the murder of a high school girl in 1988, the source said.