i'm rob nelson. >> and i'm vinita nair. cleanup crews in the gulf were set to start the critical next step to plug that undersea oil well but they are delayed. >> before crews could start the work, they discovered something wrong. diana alvear has the latest. good morning, diana. >> reporter: vinita and rob, good morning. "operation static kill" has suffered yet another setback. bp announced that a small leak has been found at the damaged well site. and that leak must be repaired before static kill can begin. cruise are closing in on pluging the damaged well permanently. >> what they will do is they will start pumping mud at a very low rate. >> reporter: that leaves what to do about the oil and chemicals used to treat it still sitting in the gulf. congressman ed markey wants the answers about the long-term events of dispersants.