Hartford (AP) — A review of the educational and mental health background of the man who carried out the 2012 Newtown massacre indicates the school system unwittingly enabled his mother to "accommodate and appease" him as his mental health problems worsened.

Adam Lanza killed his mother then shot his way into the Newtown school on Dec. 14, 2012, and gunned down 20 children and six educators before committing suicide.

A report released Friday by the Connecticut Office of the Child Advocate describes missed opportunities to provide him more appropriate treatment.

The report recommends universal screening of children for mental health needs until they are 21. It also recommends better training for educators on mental health issues and better sharing of information.