Coast Guard responding to crude spill from Shell pipeline off Louisiana

A logo of Shell is pictured at a gas station in the western Canakkale province, Turkey April 25, 2016. REUTERS/Murad Sezer

HOUSTON (Reuters) - A 2,100-barrel oil spill in the U.S. Gulf of Mexico forced Royal Dutch Shell on Thursday to shut in all wells that flow to its Brutus platform, federal regulators said.

The U.S. Bureau of Safety and Environmental Enforcement (BSEE) said a 2 mile by 13 mile (about 3 km by 21 km) sheen was visible in the sea about 97 miles off the Louisiana coast.