At least 17 people were wounded after explosives planted in a motorbike went off in the town of Chaman.
Protesters demand killers be brought to justice and a commission to probe the continuing attacks against Hazaras.
Door-to-door vaccination of more than 800,000 children under the age of five to be conducted in several cities.
Senior police official among dead as bomb explodes at mosque packed with dozens of people offering sunset prayers.
Wounded survivors and next of kin accuse authorities of failing to provide security at rally in which 129 were killed.
Masked motorcyclists throw acid on the faces of four women who were out Eid shopping in busy Quetta market.