A care home where a former employee murdered 19 residents and wounded 27 others in July failed to share information about him or take his threats seriously before the massacre, an independent panel said in a report released Friday.

The panel, set up by the Kanagawa Prefectural Government, said Tsukui Yamayuri En, a facility for people with mental disabilities situated in Sagamihara, acted "extremely inappropriately" by failing to share knowledge that may have affected the fates of its residents.

"If the information had been shared with the prefecture, the damage could have been avoided," the panel said of the knife rampage.