Jan. 12, 2016: Investigators search the cause of an explosion and fire at a home in Northfield Center Township, Ohio. (AP Photo/Tony Dejak)
An explosion and fire that killed a family of four in northeast Ohio Monday night was arson, and possibly a murder-suicide, a medical examiner said.
The Summit County medical examiner's chief investigator said Thursday that it could take weeks to make a ruling.
The fire and explosion shook homes throughout the neighborhood. Authorities say Jeffrey and Cynthia Mather were killed, along with their daughters, 8-year-old Ruthie and 12-year-old Alyson.
The state fire marshal's office says they know what caused the fire, but they aren't releasing details while the investigation is ongoing. Investigators say they've ruled out a natural gas leak.
The Associated Press contributed to this report.
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