ISLAMABAD - The Pak-Afghan relations may hit another low as Afghan officials suspect the involvement of suicide bomber from Pakistan's tribal region in attempting to blow up an Afghan government official. The development may forecast another spate of hostility just days after Afghan officials accused Pakistan's Inter-Services Intelligence (ISI) of non-cooperation on Burhanuddin Rabbani's murder probe. Afghan Interior Minister Bismillah Khan had escaped a life attempt in Kabul on Sunday after his guards killed a suicide bomber. The minister was on the way to his native town Panjshir when an attempt was made to target his security convoy. The Afghan security officials hint at the involvement of a militant offshoot based in Pakistan's North Waziristan. When approached by this newspaper, Afghanistan's head of National Directorate of Security (NDS) Rehtamullah Nabil did not rule out the possibility that the suicide bomber could be from Pakistan. "The preliminary investigations suggest that the attacker could be from across the border. Investigations are underway and we would prepare a final report by next week," he said. Nabil mentioned that a joint investigation team comprising officials of NDS, Afghan National Police (ANP) and Afghan National Army was investigating the case. "It is too early to draw a conclusion. Initial investigations give a number of leads to the possibility of militants from Waziristan." Deputy head and spokesperson NDS Yasin Zia came with a more direct response. "Such kind of incident can be prevented if Pakistan cooperates. We gave them (Pakistan) concrete evidence that the man who had blown up Burhanuddin Rabbani was trained in Quetta but there's no response from the other side," he said. Without naming any militant organisation, Zia said the investigations establish that the bomber who tried to kill the Afghan interior minister had come from Miranshah.