A spokesman for Lashkar-e-Jhangvi, a Sunni group, claimed responsibility for the bomb in Quetta, which caused casualties in the town's main bazaar, a school and a computer centre. Police said most of the victims were Shi'ites. Burned school bags and books were strewn around.
Sixty-four people including school children died on Saturday in a bomb attack carried out by extremists from Pakistan's Sunni Muslim majority, police said.
"The explosion was caused by an improvised explosive device fitted to a motorcycle," said Wazir Khan Nasir, deputy inspector general of police in Quetta.
"This is a continuation of terrorism against Shi'ites."
"I saw many bodies of women and children," said an eyewitness at a hospital. "At least a dozen people were burned to death by the blast."
Pakistan's law enforcement officials say Lashkar-e-Jhangvi has become a formidable force.
More top news
A ticket holder in Ireland has won tonight's EuroMillions jackpot which was an estimated 88.5 million euro (£76 million), Camelot said.
In an interview with Rolling Stone, Paris also revealed she tried to kill herself multiple times after being raped at the age of 14.
Drug gangs in Mexico City commonly dump the corpses of their victims in public as a way of sending warnings.