Philippine troops have recovered a homemade bomb that authorities believe was intended for use in an attack on a southern city, dpa quoted an air force spokesman as saying Wednesday. The homemade pipe bomb was recovered during a raid on a suspected safe house in Tagum City in Davao province, 975 kilometres south of Manila, on Monday evening. Major Augusto Dela Pena, spokesman for the Philippine air force, said intelligence agents conducted the raid after receiving a tip from concerned citizens. "Their search yielded a well-made, ready-to-use pipe bomb loaded inside a black knapsack," he said. No one was arrested in the raid. Dela Pena said the bomb would have been used in a "sinister plan by Jemaah Islamiyah and Abu Sayyaf" rebels to bomb "soft but high-impact target areas" in the southern region of Mindanao.