They were celebrating the death of Bhutto:

BRITISH commandos launched a devastating blitz on the Taliban ” as the evil terrorists held a party to celebrate Benazir Bhutto’s murder.
The dawn raid was staged after messages were intercepted about the sick knees-up in Afghanistan’s Helmand province.
Royal Marines crept into position as the fanatics partied the night away just hours after Ms Bhutto was killed in Pakistan.

[…]
Troop Sergeant Dominic Conway, 32 ” who directed mortar rounds ” grinned: “It must have had quite a detrimental effect on their morale.”
Sgt Conway, from Whitley Bay, Tyneside, said of the Taliban lair: “It used to be their backyard and now we’ve made it ours.”

(via)