AP: Federal investigators are hearing testimony from BP executives in a joint probe into the cause of the explosion that led to the massive oil spill in the Gulf of Mexico. BP’s Gulf of Mexico marine authority official Neil Cramond was testifying Monday in Houston. Two officials from Transocean, the owner of the rig, are set to testify later Monday. The hearings will continue through Friday. The U.S. Coast Guard and the Bureau of Energy Management, Regulation and Enforcement …