All the "perpetrators" behind attacks in Islamabad have been arrested and the country will soon be purged of terrorists, a private TV channel quoted Interior Minister Rehman Malik as saying on Friday. According to the channel, Malik said the government believed in dialogue for resolving the Balochistan issue, but the army could also be used there, if needed. He said the killing of Benazir Bhutto was part of a global conspiracy, adding that the masterminds behind the assassination would be unmasked.