Citgo's required payout for the 2004 Athos I oil spill has gone up by close to $10m, bringing the total owed the US and Tsakos Shipping and Trading to $168.2m.

Citgo Asphalt Refining Co (Carco) must pay $88m and another $9.2m in interest to the government, which had reimbursed Tsakos for oil cleanup costs.

After a 1,900-mile journey from Venezuela to Paulsboro, New Jersey, the 60,900-dwt Athos I (built 1983, scrapped 2008) in late November 2004 struck an abandoned anchor on the bottom of the Delaware River.