US troops in Mosul shot dead a 12-year-old boy who they said hurled a grenade at them, and American authorities complained that Iraqis are paying children to attack, Reuters reports. Iraqi police, however, denied the boy was involved. He was holding about $9 in his hand when he was killed. "We have reason to believe that insurgents are paying children to conduct these attacks, placing children in harm's way," said a US military spokesman. But Iraqi authorities said the boy was selling candy.