Washington, Aug 13 - US special envoy to Afghanistan and Pakistan Richard Holbrooke says Pakistan Taliban chief Baitullah Mehsud's elimination last week was a 'very big deal' in terms of security efforts in Pakistan.

'The end of Baitullah Mehsud, as we all know, is a very big deal,' he said Wednesday, citing reports of 'disarray among his people, of other factions manoeuvring' following the apparent death of the Taliban leader in a missile strike.

'Everyone is thrashing around ... This is very good news for all of us,' Holbrooke said at a panel organized by a Washington think tank. 'There's going to be some major readjustment coming up. We don't know what it is,' he said of the Taliban and it's allies in Pakistan.

Washington says there is a '90 percent certainty' that Mehsud was killed in a strike by a pilotless CIA drone earlier this month in South Waziristan.