14.6.2005 at 0400 LT off Langkawi Island, Malacca straits.Update2: Info on Jamestown here.
Ten pirates armed with weapons in a speedboat hijacked a tanker underway. One crew managed to escape in the boat used by pirates. He landed ashore and contacted marine police at Langkawi Island. Police despatched a patrol boat and located the hijacked tanker off Pulau Lebar. Subsequently, pirates surrendered and they were taken to Langkawi for investigations. (see post on this being a potential "inside job" here and links therein)
12.06.2005 at 1100 LT at Warri region, Nigeria.
A group of armed persons boarded an offshore processing tanker. They took hostage all 45 crewmembers. After negotiations boarders departed on 15.06.2005 at 0945 LT. No injuries to crew. (update: Tanker apparently the Jamestown. Tale of a released hostage here)
The Jamestown is a Steel Tanker Floating Production System built in 1957 at Newport News, Va. The Jamestown was converted to an FPSO [Floating Production, Storage and Offloading] in 1995 at J. Ray McDermott's Fabrication Facility at Harbor Island, Port Aransas, Tx.
Update3: Nigeria - red arrow points to general area of seizure
Update4: Nigeria and its oil here.