Police investigating the death of 14-year-old Jade Anderson, who was killed after being attacked by dogs, said "we do not have anything evidentially to categorically prove a crime has been committed."
The teenager was found alone with five dogs at her house in Wigan on March 26.
A Greater Manchester Police statement said: "At this stage of the enquiry, we do not have anything evidentially to categorically prove a crime has been committed, therefore it is unlikely at this stage we will be seeking to bring a prosecution.
"That is not to say that no prosecution will ever be brought and we still have a number of inquiries to make.
"While we do not want to be drawn on the politics surrounding the legislation of dangerous dogs, we are nonetheless bound by the law.
"As always our thoughts are with Jade's family and we continue to offer them support at such a difficult time of their lives."
A teenage girl thought to have been attacked by "aggressive and out of control dogs" has been named by sources as Jade Anderson.
The death of 14-year-old Jade Anderson comes after a string of dog attacks in recent years.