Daily Times - Site EditionTightly guarded independence day celebrations in Afghanistan were marred by new attacks on aid workers and security forces as well as an explosion that ripped through the home of President Hamid Karzai’s brother.In Logar province, Taliban guerrillas killed 10 policemen, officials said. Abdul Khaliq, police chief of Logar province, and several other senior police officers were among those killed in an ambush on Monday. “They were in their cars when the incident happened,” he said. “There is no doubt that the Taliban were behind it.”