A federal judge on Tuesday dismissed prosecutors' argument that a BP subsidiary violated its probation after an oil spill because of another spill on Alaska's North Slope.

Judge Ralph Beistline also lifted BP Exploration (Alaska) Inc.'s probation altogether.

BP had been convicted of negligent discharge of oil in 2007 for a 200,000-gallon (757,000-liter) spill on the North Slope a year earlier. There was another spill of 13,500 gallons (51,100 liters) in 2009.

Last month, government lawyers sought to have BP's probation revoked for the latest spill, meaning the probation period could have been lengthened or the company could have faced additional penalties.

In his ruling, Beistline said the government failed to prove the company committed criminal negligence.

"We are pleased with the decision and appreciate the court's attention," BP spokesman Steve Rinehart said in an email to The Associated Press. "We know that the privilege of working in Alaska comes with a responsibility to maintain high standards. We will continue our commitment to running safe and compliant operations."

Emails seeking comment from the U.S. attorney's office in Anchorage were not immediately returned.

Prosecutors said BP's history of environmental crimes in Alaska began in February 2001 when it pleaded guilty to releasing hazardous materials at its Endicott facility on the North Slope. The company was fined $500,000, placed on probation for five years and ordered to create a nationwide environmental management program, prosecutors said.