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| Supporters of Pakistan Muslim League-Nawaz (PML-N) burn a US flag during a protest in Multan. |
Washington has backed a full inquiry and sent its condolences, while NATO chief Anders Fogh Rasmussen on Sunday voiced regret over the "tragic, unintended" killings, but did not issue a full apology.
The chief of US Central Command on Monday appointed Brigadier General Stephen Clark, from Air Force Special Operations Command in Florida, as the investigating officer for the probe that will also include a NATO representative, officials said.
The governments of Afghanistan and Pakistan "will be invited to participate," Central Command said in a statement.
Pakistan so far has dug its heels in, reacting furiously to what it called an "unprovoked" strike, worsening US-Pakistani relations already in crisis after the killing in May of Osama bin Laden north of Islamabad by US special forces.
The US military insisted the war effort in Afghanistan would continue despite the disruption to regular supply lines.
In an interview with CNN, Prime Minister Yousuf Raza Gilani said incidents such as at the NATO cross-border attack further alienated the Pakistani masses, leaving his government isolated in its unpopular alliance with the US.
"Business as usual will not be there, therefore we have to have something bigger so that to satisfy my nation, the entire country," he said in English.
Asked whether the US-Pakistani alliance can continue, he replied: "That can continue on mutual respect and mutual interest", adding that both were currently lacking.
"If I can't protect the sovereignty of my country how can we say it's a mutual respect and mutual interest?"
White House spokesman Jay Carney said President Barack Obama believed Saturday's incident was "a tragedy," adding that Washington valued what he called an "important cooperative relationship that is also very complicated".
It remains unclear what happened at the dead of night in some of the most hostile terrain on Earth. Afghan and Western officials reportedly said the Pakistanis opened fire first. Pakistan insists the attack was unprovoked.
NATO and Afghan forces "were fired on from a Pakistani army base", a Western official told the Wall Street Journal. "It was a defensive action."
An Afghan border police commander, speaking on condition of anonymity as officials have been told not to speak to media before an investigation is completed, said NATO troops hardly ever open fire unless they are attacked.
"To me it's almost clear that they (ISAF) came under fire from that area. Without that they would have not returned fire," he told AFP.
He said the Taliban as well as Afghan and Pakistani security forces have posts very close to each other due to the rugged, mountainous terrain.
"This is not true. They are making up excuses. And by the way, what are their losses, casualties?" Major General Athar Abbas, Pakistan's chief military spokesman, wrote to AFP in a text message.
He later told Pakistani television channel Geo that 72 Pakistani soldiers have been killed and 250 wounded by fire from across the Afghan border over the last three years.
Asked about expressions of regret by NATO he said: "We do not accept it because such kind of attacks have been taking place in the past... Our leadership will decide about further reaction."
Britain's Daily Telegraph newspaper on Monday quoted wounded survivors of the raid, who insisted they were victims of an unprovoked attack.
In retaliation, Islamabad has blocked NATO convoys from crossing into Afghanistan, ordered a review of its alliance with the United States and is mulling whether to boycott a key conference on Afghanistan next month.
Pentagon press secretary George Little told reporters the Afghanistan campaign would press on despite the interruption to supply routes.
"Everyone realises we have an enemy to engage in Afghanistan and the US military is prepared to carry on," Little told reporters.
NATO says that for now its troops will not be affected by the disruption.
Hundreds of enraged Pakistanis took to the streets for a third day on Monday, blocking roads to demand that Pakistan end its troubled alliance with the United States.
Key ally China, seen by Islamabad as a crucial counterweight to American influence, said it was "deeply shocked" and called for an investigation.
On the Fox News Sunday talk show, US lawmakers vented frustration over Pakistan, with Republican Senator Jon Kyl demanding Islamabad cooperate with the United States in order to maintain billions of dollars in financial aid.
