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Family members of Bob and Colleen VanWagner spent time searching through the rubble of what was once the couple’s home in South Haven Township. 

SOUTH HAVEN — South Haven Area Emergency Services and the Michigan State Fire Marshall’s office have concluded their investigation into the cause of last week’s house explosion in South Haven Township that claimed the life of a woman and left her husband in critical condition.

“It has been determined that an LP gas leak developed outside the residence and subsequently migrated to the basement of the home and was ignited by an unknown source,” Fire Chief Brandon Hinz said in a written statement.