BP said it has stopped the flow of oil from its undersea well, which ruptured in April this year following the Deepwater Horizon explosion.

The well, which has been leaking into the Gulf of Mexico since the explosion, has resulted in the worst environmental disaster in the US.

BP said it stopped the leak on Thursday with the tight-sealing containment cap that was installed three days earlier atop its blown-out well.

BP aims to plug the leak permanently with a relief well intended to intersect the ruptured well – which extends 2.5 miles under the seabed – and seal it with mud and cement next month.

BP’s US shares closed up 7.6% on Thursday after it announced it had shut off the flow of oil from the well. Traders were eager to see if the rally would continue in London’s Friday trading, reports Reuters.