Pakistan authorities arrested a senior leader of former Prime Minister Imran Khan's party on Thursday as the government deployed the army to help end deadly unrest sparked by Khan's arrest three days ago. Shah Mahmood Qureshi, who served as foreign minister in Imran Khan's cabinet during his four year premiership, was arrested overnight, a statement on his Twitter profile said. Two other senior leader of Khan's Pakistan Tehreek-e-Insaf (PTI) party, Asad Umar and Fawad Chaudhry, were also arrested on Wednesday.