KABUL: NATO was concerned by a spike in terror attacks but would not enter Pakistan to hunt down militants based there, the alliance's Secretary General Jaap de Hoop Scheffer told reporters in Kabul.n nScheffer was visiting amid high tension between Afghanistan and Pakistan over the violence, including the bombing of the Indian embassy here this month that Kabul has directly blamed on its neighbour's intelligence agency.n n"I cannot think of anyone who would consider it acceptable that many terrorists from all over the world gather in a certain area and create mischief and havoc there," Scheffer told reporters, in a reference to militant bases in Pakistan.n n"The bottom line is that the present situation cannot be acceptable for anyone," Scheffer told reporters after talks with President Hamid Karzai.n nAfghan and Western officials have long said that the Taliban and Al-Qaeda have been able to regroup in Pakistan's semi-autonomous tribal areas after they were expelled from Afghanistan in 2001 in a US-led invasion.n nSome accuse Islamabad of not doing enough to tackle them and criticise its efforts to negotiate peace deals.n nScheffer said Pakistan had to be part of the solution to the problem.n n"Our forces in Afghanistan are also the victims of the surge and uptick in violent incidents we have seen recently. But let us practise a regional approach and let us involve all the regional actors here," he said.