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.

More than 75 percent of Gabriel House residents are enrolled in Medicaid, state officials have said, and it charges significantly less than a typical assisted living facility does for private-paying patients.

Hundreds are expected to attend a fundraiser Friday evening for the surviving residents of a fire that tore through a Fall River assisted living facility earlier this week.