The PSNI and a Northern Ireland health authority are being sued over a convicted sex offender who killed himself and six members of his family in a house fire in Co Tyrone in 2007.
The fire at a house in Omagh claimed the lives of Arthur McElhill, his partner Lorraine McGovern and their five children, who were aged between 13 and ten months old.
A coroner later ruled that McElhill had started the fire because Ms McGovern had threatened to leave him.
Papers lodged in the Belfast High Court on behalf of the victims' families claim damages for alleged negligence in the supervision and monitoring of McElhill.
Proceedings have been issued against the Western Health and Social Care Trust and the PSNI Chief Constable.
The case is due to be reviewed next October.