In a statement, foreign affairs adviser also says India should not be granted special status in U.N. Security Council.
Private Schools Teachers Association president criticizes decision, saying educators should not be carrying guns.
Police say vaccination drive will continue despite the attack.
U.S. president is first American leader to be invited to the Indian event.
Jamaat-e-Islami calls for U.N. ban on blasphemy in Islamabad demonstration.
Protesters demand Islamabad cut all ties to France.