Updated

An attorney for BP PLC says "irreparable injustices" are taking place because of the way a court-appointed administrator is making settlement payments from the 2010 Deepwater Horizon oil spill.

Jed Olson argued Monday in a packed courtroom before a three-judge panel of the 5th U.S. Circuit Court of Appeals.

A lower court refused to block payments to businesses that claim the spill cost them money.

An attorney for Gulf Coast businesses and residents questioned whether the appeals court has authority to change the agreement.

Samuel Issacharoff (is-AK'-uh-rahf) argued the oil company was aware of the settlement terms and the administrator's methods.

At stake are billions of dollars in settlement payments stemming from the blowout of BP's Macondo well in the Gulf of Mexico.