Anadarko owned a 25% non-operating minority interest in the Macondo Prospect, which was 65% owned and operated by BP, and was affected by the "Deepwater Horizon" oil spill in 2010. Under the joint operating agreement, Anadarko was required to pay its 25% share of costs related to any incident—unless that incident was caused by its partner's gross negligence or willful misconduct. Anadarko claimed that BP was guilty of gross negligence or willful misconduct which led to the explosion.