BEIJING (Agencies) Organisation of Islamic Cooperation (OIC), China and Russia rallied behind Pakistan expressed deep shock over Nato airstrikes that left 24 Pakistani soldiers dead and called for an investigation into the incident. China is deeply shocked at the incident and expresses strong concerns and deep condolences to the victims in Pakistan, foreign ministry spokesman Hong Lei told a regular news briefing. China believes that Pakistans independent sovereignty and territory should be respected and that this incident should be earnestly investigated and handled in a serious manner. While conveying its heartfelt condolences to the bereaved families and the government of Pakistan, OIC Secretary General Professor Ekmeleddin Ihsanoglu said the attacks are indeed serious violation of Pakistans sovereignty and are totally unacceptable, an OIC statement said on its website. Ihsanoglu assured Pakistan of the continued solidarity of the OIC and expressed his expectation for the prevention of any recurrence of such incidents. The Secretary General then urged Nato to avoid any action that could further complicate the already dire security situation in the region, the statement said. Russia also called for a 'meticulous investigation into a Nato raid in Pakistan that killed 24 soldiers, calling strikes that violate state sovereignty unacceptable. Leaders of Nato in Afghanistan should carry out a meticulous investigation into this incident, Foreign Minister Sergei Lavrov told his Pakistani counterpart Hina Rabbani Khar in a telephone call. Violations of state sovereignty, including in the cases of planning and carrying out anti-terrorist operations, are unacceptable, he said, according to a statement from his office.