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Exelon Generation will be testing its emergency warning sirens for areas within a 10-mile radius of Three Mile Island on Thursday, June 7.

The semi-annual full volume test will be conducted at about 12:15 p.m. and sound for three minutes.

More: Three Mile Island to close in 2019 without policy reform

Its purpose is to warn residents living near the nuclear generating station in the event of an emergency.

Hearing one of the 96 sirens located in parts of Cumberland, Dauphin, Lancaster, Lebanon and York counties serves as an alert to tune into an Emergency Alert System television or station for information.

Three Mile Island is located in Dauphin County, about 12 miles south of Harrisburg near northern York County.

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