| GEO Business|
| BP tests tricky oil plug plan|
| Updated at: 0935 PST, Wednesday, May 26, 2010|
LOS ANGELES: BP began critical testing of its "top kill" plan to plug the gushing Gulf of Mexico oil well as President Barack Obama vented frustration over the energy giant's inability to contain what is likely the largest U.S. oil spill ever.
Five weeks into the unchecked disaster, Obama has told aides to "plug the damn hole" and plans to make his second visit to the Louisiana Gulf coast on Friday.
But before he heads to the disaster zone, Obama is expected to send a message on Thursday to the oil industry of tougher safety requirements for offshore drilling rigs, an official said.