Dubbing northwestern Pakistan as "a real stew of terror," former US National Security Adviser Stephen Headley has said Islamabad needs to do more against extremist elements within its territory.
"What's happening in northwest Pakistan, once again, it's troublesome," he told MSNBC news channel.
Headley was referring to the investigations following the failed Times Square bomb attempt, which had revealed that Pakistani Taliban was responsible for this.
Pakistani-American Faisal Shahzad, arrested for the crime, had told investigating agencies that he received the training in bomb making in Waziristan.
"I think what we're finding now is certainly training in Pakistan, maybe money. The issue is, was he directed by the Taliban. They're in the midst of that investigation," Headley said.
"It's a real stew of terror, and it does potentially reach the United States. That's the lesson we have to draw from this, and that's why it's important that the Pakistani authorities step up there," he said in response to a question.
His remarks came a day after Secretary of State Hillary Clinton said that Pakistan needs to do more against terrorism.
Headley said there was a time two years ago when terrorists in northwest Pakistan were really a problem for American troops in Afghanistan.
But now, the terrorists are a threat to Pakistan itself, he said. "And that's why Afghans, Americans and Pakistanis have an interest in getting control of this situation," he said.
"We have to understand that they're linked. You have to solve Afghanistan to stabilise Pakistan. And you have to have a stabilised Pakistan if we're going to get a solution in Afghanistan. These are linked, and the two countries need to work together with us," Hadley argued.
On US-Afghan relations, Headley said obviously there were strains between the United States and Afghanistan, the administration here and in Kabul and between Presidents Barack Obama and Hamid Karzai.