A photo show what's left of the portable toilet that had been set up at the site of the new Home and Holiday Decor superstore on Route 42.
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Washington Township police say the blast happened just before 8 p.m. Sunday.
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The area was evacuated as a precaution but the bomb squad gave the all-clear around 10 p.m.
The explosion is now under investigation by police and the fire marshal's office.