New Delhi, Oct 4 : Afghan security forces Wednesday opened "unprovoked and indiscriminate" fire on pedestrians crossing the Chaman border and killed two Pakistani civilians, including a child, the Pak military's media wing said, as per the media reports. In a statement, the Inter-Services Public Relations (ISPR) said the unfortunate event took place at 4pm at the Friend Ship Gate of the border crossing along the Pakistan-Afghanistan border in Balochistan. "The incident occurred at the outbound gate located on the zero line," the statement said, noting that two Pakistani citizens including a 12-year-old were killed while another child was injured. In response, Pakistani troops exercised extreme restraint and avoided any exchange of fire in the presence of innocent passengers to avoid collateral damage, the ISPR statement said. The Chaman border has been, over the years, repeatedly closed and then re-opened after Afghan forces resorted to such extreme measures, with the Pakistani side stressing restraint, Geo News reported. In today's statement, the ISPR said Islamabad has approached Kabul's authorities to inquire about the reason behind such an irresponsible and reckless act and to apprehend and hand over the culprit to Pakistani authorities. The military said that the Afghan government is also expected to exercise control over its troops and impart discipline to act responsibly in order to avoid the recurrence of such incidents in the future. The development comes a day after Pakistan told hundreds of thousands of Afghans living illegally in Pakistan to leave voluntarily until November 1 or face deportation, Geo News reported. The order came as Pakistan grapples with a rise in attacks the government blames on militants operating from Afghanistan. Interim Interior Minister Sarfraz Bugti said 1.7 million Afghans were in Pakistan illegally, Geo News reported. /IANS