Assisted living centers are rare in Mass, but many families still don’t know what they offer or how they differ from other elder care facilities.

A 10th victim has died from the fire that ripped through a Massachusetts assisted-living facility earlier this week, officials said Thursday, as records and accounts from staff raise concerns about conditions at Gabriel House before the blaze. ‘You don’t come back from that’: Fall River paramedics speak for 1st time after Gabriel House fire

The family of a resident at the Gabriel House assisted living facility has retained a law firm to investigate the circumstances leading up to the deadly Sunday fire that killed nine people and left dozens injured.

All 273 assisted living facilities in Massachusetts must send letters to all residents and families detailing fire safety protocols, evacuation procedures and key points of contact, the state announced Friday.

There’s no doubt in my mind that that fire was destined to kill 50-plus people,” Fall River Fire Chief Jeffrey Bacon said Wednesday.

The investigation into the fire’s cause is ongoing but “does not appear to be suspicious,” according to the Bristol County district attorney's office.