Senators Barbara Boxer and Dianne Feinstein called on federal regulators to investigate the cause of Southern California Gas Co.’s massive natural gas leak at its Aliso Canyon storage facility, the Los Angeles Daily News reported Friday.

Boxer and Feinstein announced they would introduce an amendment next week to energy legislation currently on the Senate floor that would direct Energy Secretary Ernest Moniz to lead a broad federal review of the cause and the response to the leak. The senators want the Energy Department action to result in, according to their joint statement, “recommendations on immediate steps that could assist in solving this gas leak and in preventing and responding to future incidents.”