Washington (CNN) -- The United States has issued a new warning to ships passing through critical shipping lanes in the Middle East and along the African coast after confirming a terror attack took place there this year.
The Abdullah Azzam Brigades, a group based in southern Lebanon that is linked to al Qaeda, claimed in August that a suicide bomber had attacked the Japanese tanker the M. Star on July 28.
The United States has now determined that the claim is valid, according to a statement from the U.S. Maritime Administration.
It warned ships that the group "can conduct further attacks on vessels in areas of/in the Strait of Hormuz, southern Arabian Gulf and western Gulf of Oman."
The explosion on the M. Star injured one crew member but did not cause a spill or halt shipping traffic.
CNN Pentagon Correspondent Barbara Starr contributed to this report.