[This story was updated at 10 p.m. ET on July 12.] After days of preparation, BP's effort to replace the loose-fitting cap that has been collecting oil for the last few weeks with a sealing cap ...

The cap is a temporary measure until the gusher can be plugged deep underground, where a seal will hold better than by blocking the powerful gusher from the top. BP plans to shoot cement and heavy ...

BP again plans to ramp up testing of its newest well cap system Thursday. The multi-stage test, which will take 48 hours, will determine the company’s next step in its attempt to control the leak. If ...

BP engineers were back to the slow work of trying to choke the Gulf of Mexico oil gusher with an untested cap after replacing a leaky pipe Thursday, the latest delay in the uncertain fix. Kent Wells, ...