The law enforcement agencies have failed to recover Ali Haider Gillani, son of former prime minister Syed Yousuf Raza Gillani, despite lapse of 26 days. Sources disclosed that despite all out efforts the security agencies could not trace the kidnappers as a result of which the family of the abductees was highly tense.  Ali Haider Gillani was kidnapped by unidentified armed persons from Farrukh Town on May 9 during his election campaign and two persons were also killed in this incident. Sources said that although police were investigating the incident, no kidnapper either claimed the responsibility or contacted the family.