Two suspected insurgents were killed when a bomb they were trying to plant on a key highway in northeastern Afghanistan exploded, an official said Monday. The pair, who had Afghan identity papers, were killed while placing a bomb on a road which links the eastern city of Jalalabad to Kunar province, said Interior Ministry spokesman Lutfullah Mashal. "During the investigation police found Afghan identities and voting cards in their pockets," Mashal said. The two seemed to have used their voter cards in last year's presidential election, he said.