What caused it: Mysterious Hole In Yard Puzzles Officials, Experts

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A Basking Ridge homeowner would really like to know why there’s a crater in her front yard.
“To me it looked like something blew out of the ground because the grass was folded back, the rocks and dirt were all spewn out into the cul-de-sac and across the driveway,” Sue, who asked not to be identified out of concern that the hole may draw unwanted onlookers and crowds, said.

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