The Islamist Muttahida Majlis-e-Amal (MMA) will move the Supreme Court against the killing of 80 people in an air strike on a seminary in Pakistan that has caused outrage against President Pervez Musharraf and the US.
Mubarak Saaduon Al Mutawa, general secretary of International Islamic Committee for Human Rights and a renowned lawyer based in Kuwait, is also planning to take the matter to the International Court of Justice, The Nation reported on Saturday.
"We will move the apex court against the extra judicial killing of innocent people, most of them students who were learning the Quran," said Sahibzada Haroon Rasheed, the MMP MP from Bajaur where the killings took place.
MMA, Pakistan's largest rightwing alliance, is part of the coalition governments in North West Frontier Province (NWFP) and Balochistan and has a strong presence in the National Assembly.
It is spearheading the protests across Pakistan against the attack on the seminary.
While Musharraf has said the attack was caused by the presence of Al-Qaeda activists in the seminary, the opposition parties insist that the victims were innocent students.
MMA leaders say the seminary had no links with Al-Qaeda or the Taliban.
Rasheed said his residence was one-and-a-half kilometre from the place of tragedy and he was sure that there were no militants or terrorists in the seminary.
"We have hundreds of witnesses who can be produced in the Supreme Court to prove the fact that the attack was carried out by Americans and there were innocent people inside the building," he said.
Rasheed alleged that US missiles hit the seminary, and later the Pakistan Army helicopters fired some rockets to show as if it was a Pakistani operation.
"The attack was pre-planned and the Pakistan government had prior information of the incident," he said.
Rasheed alleged that the US launched the attack after its drone aircraft had monitored the area throughout the holy month of Ramadan.
He said that no human rights organisation or media team were allowed to visit the site of tragedy.
"We hardly managed to gather the scattered parts of bodies in sacks for burial."