UPPER FREEHOLD — State police say a crash involving two motorcycles has left both riders dead.

It's not yet clear what caused the accident, and the names of the people killed have not been disclosed.

The crash on Route 524 in Upper Freehold Township was reported shortly before 2 p.m. Sunday. Authorities shut down a stretch of the roadway while they investigated the accident.

It didn't appear that any other vehicles were involved in the accident. No other injuries were reported.

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