Somalia ? Pirates hijacked a Thai fishing boat with 16 crew members Tuesday off the coast of Somalia, the same day a major Norwegian shipping group ordered its tankers to sail around Africa rather than use the Suez Canal because pirates had seized a Saudi supertanker.

The U.S. and other naval forces decided against intervening in the seizure of the supertanker, which was carrying $100 million in crude. The pirates captured an Iranian cargo ship Tuesday — the eighth ship seized in 12 days.

Odfjell SE said it made the decision to divert its ships after pirates seized the Saudi Arabian supertanker MV Sirius Star Saturday hundreds of miles off the coast of Kenya, the most brazen attack yet by Somalian pirates.

“We will no longer expose our crew to the risk of being hijacked and held for ransom by pirates in the Gulf of Aden,” said Terje Storeng, Odfjell’s president and chief executive. “Unless we are explicitly committed by existing contracts to sail through this area, as from today we will reroute our ships around Cape of Good Hope.”