The ceremony was scheduled to be held on Monday, but President Alvi had refused to administer the oath to the lawmakers, compelling the government to postpone it.
Police in Pakistan's restive Khyber Pakhtunkhwa province said on Monday that an initial probe has suggested that the banned terrorist group Islamic State is behind the suicide attack on a political convention of a hardline Islamist party that killed at least 46 people and injured over 100.
