A central Pennsylvania district is closing all schools so officials can test for mold.

East Pennsboro closed all schools on Wednesday as a precaution to check the heating and cooling systems in its buildings.

Students had just returned Monday after summer vacation.

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Mold was found Friday on ceiling tiles at the high school and was later found on pipes at the elementary school. A testing company blamed the growth on extreme humidity and rain over the summer.

A decision on whether schools will reopen Thursday will be made later Wednesday.