Pittsburg, CA — Officials in Pittsburg are investigating the death of a woman believed to have died of carbon monoxide poisoning in a home.

Three children and a man who was disoriented and incoherent were also found in the home near Vincent and School Streets just after 7 p.m. Thursday. The man and children have been hospitalized but are expected to recover.

PG&E crews found a very high level of the colorless and odorless gas in the home.

The early investigation shows it came from a heater.