Published: Aug 05, 2010 9:14 AM EDT
Updated: Aug 06, 2010 4:30 AM EDT

NEW ORLEANS (AP) — BP says engineers have finished plugging the blown-out Gulf of Mexico well with cement in their effort to permanently seal it.

The company said Thursday that its engineers finished pumping cement into the deep-sea well at 2:15 Central time.

On Wednesday they pumped enough mud into the well to push the oil back to its underground reservoir. Crews must now wait at least a day for the cement to dry.

BP bottled up the leak in July with a cap that was always considered a temporary solution.

Executives say the static kill may permanently plug the well. But either way they plan to pump mud and cement through a relief well this month to forever suffocate the source of the oil.