CANTON, Pa. (AP) — A natural gas company has suspended "fracking" at all of its wells throughout Pennsylvania until it figures out the cause of a spill in the northern part of the state.

Chesapeake Energy Corp. said Thursday that crews have significantly reduced the flow of chemical-laced water from its out-of-control well near Canton in Bradford County.

Spokesman Brian Grove says that the exact cause of Tuesday night's breach is unknown, but that it's located in a wellhead connection.