The four adults killed by suspected carbon monoxide poisoning in a New Hampshire home earlier this week were all residents of Newton, authorities said.

Wakefield, N.H., police were dispatched to a home in the 2900-block of Province Lake Road at around 4:20 p.m. Wednesday to conduct a welfare check. The state fire marshal’s office was brought in and the initial investigation suggested they died from carbon monoxide poisoning.

The identities of the four deceased adults were not disclosed pending notification of the next of kin. On Friday, New Hampshire authorities identified them as residents of Newton, Massachusetts.

They are Matthew Goldstein, 52; Lyla Goldstein, 54; Valerie Goldstein, 22; and Violet Goldstein, 19.

Following autopsies scheduled for Thursday, the New Hampshire Office of the Chief Medical Examiner has determined Matthew Goldstein’s cause of death was carbon monoxide poisoning and the manner of death remains pending. The cause and manner for the others are all pending.

“State Fire Marshal Toomey would like to remind everyone of the importance of having working carbon monoxide alarms in their homes,” officials wrote. “In the event of an alarm activation, residents should immediately exit their homes and call 9-1-1. Anyone with questions about home fire and carbon monoxide safety should contact their local fire department or the New Hampshire State Fire Marshal’s Office.”

Carbon monoxide is is an odorless, colorless gas that can cause sudden illness and death if inhaled, according to the CDC. It claims the lives of hundreds of people every year and makes thousands more ill.

Many household items including gas- and oil-burning furnaces, portable generators, and charcoal grills produce this poison gas.

“Install battery-operated or battery back-up CO detectors near every sleeping area in your home,” the CDC states. “Check CO detector batteries when you change the time on your clocks each spring and fall to be sure they are functioning properly… Replace your CO detector following the manufacturer’s instructions or every 5 years. Set a reminder on your smartphone or other device calendar when you purchase and install the detector.”