"Top Kill" Could Begin Today (UPDATED)

This will be the first stab at shutting down the well since the April 20 blowout and fire that killed 11 workers on the drilling rig Deepwater Horizon.

BP chief executive Tony Hayward told CNN Wednesday morning that the company is still collecting data to determine whether to proceed with the maneuver. "We'll take a decision within the course of today," Hayward said.

If he determines that it is safe to proceed, Hayward told NBC's "Today" show, the procedure is expected to happen Wednesday.

Will keep you informed from our man on sight.

Update: 'Top kill' procedure begins