Angry protests erupted in Kabul for a second day Monday as demonstrators protesting allegations that Western troops torched a Koran pelted police with stones, injuring 15 officers, an official said. Hundreds of demonstrators massed on the northern outskirts of the capital preparing to march into the city as some hurled stones at riot police trying to bring them under control, said interior ministry spokesman Zemarai Bashari. 'They attacked police and 10 to 15 policemen are injured,' he said, adding: 'Police have been extra tolerant trying to avoid any scuffle with the protesters.' In a similar protest in Kabul on Sunday, demonstrators torched an effigy of US President Barack Obama and attacked police. Police responded by firing into the air to disperse the crowd. The demonstrators, mostly men, chanted: 'Death to America, death to Jews and Christians!' as they burned a model of Obama and a United States flag. Some wore black ribbons on their foreheads, calling for jihad. There were similar demonstrations, but on a smaller scale in the eastern city of Jalalabad and southern Kandahar last week. A spokeswoman for the NATO-led International Security Assistance Force (ISAF) said the claims had been investigated and found to be groundless. 'The investigation determined that neither ISAF nor the Afghan national army had burned any Koran in Wardak province,' the ISAF spokeswoman said. 