Halliburton is being investigated by a government panel that claims the oil services company may have played a role in the deep water platform explosion in the Gulf of Mexico. Halliburton may have supplied cement to BP, that the company knew was unstable, for the purposes of sealing the well.
In the past, Halliburton has blamed BP for failing to test the cement and various other measures that may have caused the incident. Millions of barrels of oil were dumped into the Gulf of Mexico as a result.
Halliburton shares traded almost 8% lower on the news Thursday.