What's intriguing here are the motifs and who 's behind it.
The attackers had to make quite an effort to get to the remote base camp where no-one lives or wanders, except for foreign climbers and trekkers. And the victims weren't typical westerners (mostly Ukrainians and Chinese).
It doesn't fit any pattern.

around forty trekers went to Skardu today on KKH will trekking on K2. Now security increased and more securit on road than before. those innocent climbers was stationed at the base camp for the last few weeks and atackers reach there, and for trekers to K2 area, they just pass in security convoy, safe to travel there on KKH. and when in baltistan, very safe to travel around. K2 trek is safe and area is very safe with Shia Muslim popultaion.. and army, police shcek post on way to there. only one entry point. no other entry exit way.

Odetta77 ! don't take wrongg meaning to the hospitality of ghizer valley and Governor. Those sweetest people and very hospitable, not many tourist go there. so not use to tourit there.. but very nice and peaceful people..

Re - "first it needs to be clear who is responsible for this attack, there are always people who know exactly who did it" ~ nowornever
Tehrik-e-Taliban contacted news networks early on and claimed responsibility for it.

Today the UK Foreign Office changed its travel advice to advise against all non-essential travel to Gilgit-Baltistan. As a result the UK trekking company I was going to be doing the K2 / Gondoro La trek with have had no choice but to cancel our trip.
I think the Foreign Office have over-reacted and a lot of innocent Pakistanis will lose their livelihoods as a result of this :-(

10 foreigners killed and threats to target more. What then would b justification for u. Why not use a Pakistani firm and save money too

An over-reaction or otherwise aside, the FCO decision will mean other UK companies will cancel trips and make it very difficult to get insurance.
scoodly
I'm in the same boat as morpho. My K2 trip was cancelled by the operator. Now I'm looking for ideas for another 1-2 week hiking trip in the Asia/Indian subcontinent area for September. Any ideas? It seems it's too early for Everest trekking - what about India/Sikkim, are there good treks there for September? Any advice on treks or outfitters appreciated.
The Taliban thrives in fear, poverty and chaos. No better way than to attack the life blood of Northern Pakistan than to murder tourists, who are generally a pretty fickle bunch, who will drop the destination like 4th period French Class. This same strategy was used in Egypt with some success until the Egyptian people rose up and stopped it. This will take tour operators, drivers, hotel owners, restaurant operators and guides to rise up and stop the violence by reporting the activities.