As Tropical Depression Bonnie dissipates, Energy giant BP is moving vessels and workers back to the site of the Gulf of Mexico oil spill to plug the firm's blown-out well.

US National Incident Commander Thad Allen said during a conference call with reporters on Saturday that another operation aimed at plugging the well could begin by the end of the coming week, Bloomberg reported.

The oil firm was forced to move most of its ships away from the spill site on July 22 due to the approaching storm.

BP is going to start what is called a "static kill" operation that involves forcing heavy drilling mud into the top of the well cap.

Meanwhile, as the hurricane season is expected to pick up later in the summer, the move of vessels to and from safer waters during a storm could be more difficult.

"We will be playing a cat-and-mouse game for the remainder of the hurricane season," Allen said.

The well has poured millions of barrels of crude into the sea, creating the worst environmental disaster in American history.

More than three months into the Gulf oil disaster, the London-based company has been unable to find an ultimate answer to kill the spill completely.

The oil disaster in the Gulf of Mexico started in April after an explosion on the Deepwater Horizon oil rig caused the sinking of the facility. Eleven people died in the blast.