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HARRISBURG, Pa. (AP) — Pennsylvania’s attorney general is opening an investigation into a $2.5 billion natural gas liquids pipeline across southern Pennsylvania that’s been plagued by spills of drilling fluid and improper construction methods.

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Attorney General Josh Shapiro said on Twitter on Tuesday that his office is taking the investigation into the Mariner East 2 pipeline on a referral from Delaware County’s district attorney.

The pipeline has been operating for just over two months and is owned by Texas-based Energy Transfer.

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The company’s pipelines in Pennsylvania include the Mariner East 1, 2 and 2X and have drawn millions in fines and several temporary shutdown orders from state agencies.

Meanwhile, Chester County’s district attorney is demanding documents from the company as part of a criminal investigation. Energy Transfer has said it is confident that it hasn’t violated criminal laws.

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