LAHORE - Terming wave of violence in Karachi as a conspiracy against the country, Chairman Pakistan Tehreek-e-Insaf Imran Khan has urged the citizens to make sincere efforts for foiling the nefarious designs of the enemy. In a statement issued here on Tuesday, he expressed sorrow and grief over the loss of precious human lives during the violence. Imran Khan said that the government has failed to stop target killing and provide security to public life and property in Karachi. He condemned assassination of MQM MPA Raza Haider and expressed sympathies with the bereaved family.