NEW ORLEANS (AP) — Two BP employees have been indicted on manslaughter charges in the 2010 Gulf oil spill disaster.

The federal indictment unsealed Thursday in New Orleans names BP well site leaders Robert Kaluza and Donald Vidrine. The indictment claims they acted negligently in their supervision of key safety tests performed on the Deepwater Horizon drilling rig before an explosion killed 11 workers in April 2010.

The indictment says Kaluza and Vidrine failed to phone engineers onshore to alert them of problems in the drilling operation.

The charges come on the same day that BP announced that it has agreed to pay $4.5 billion in a settlement with the U.S. government to plead guilty to felony counts related to the deaths of 11 workers and lying to Congress.