Two children were killed Sunday in a rocket attack in eastern Afghan province of Kunar as President Hamid Karzai congratulated his countrymen over the successful conclusion of the historical elections. The tragic incident emerged in the province, bordering Pakistan, mounted the death toll to 11.A senior police official in Kunar said the rocket, allegedly fired from Pakistan's border area, hit a house in the Marawara district, killing two children on the spot while a young girl sustained injuries. The girl was shifted to hospital where her condition is stated to be serious. The police official did not mention age and names of the children but said they were youngsters.