FREEHOLD, N.J. (CBSNewYork) — A courthouse in New Jersey remains closed while testing continues to find out why the building’s workers were sickened earlier this month.

WCBS 880’s Sean Adams On The Story

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The Monmouth County courthouse was set to reopen Monday, but that plan was called off Sunday afternoon.

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The building in Freehold was closed last Monday when 25 people were hospitalized and about 40 more were treated for nausea, chest pain and other issues.

In the meantime, judges have been relocated to municipal courts.

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The cause of the workers’ illnesses remains a mystery.