No group immediately claimed responsibility for the attack.
In the second attack in the evening in Chaman city, two civilians were killed and 10 others injured when militants planted an Improvised Explosive Device (IED) on a motorcycle parked on Mall Road.
At least 20 people were killed and almost 50 injured when a bomb aimed at targeting the minority Shia community exploded at a vegetable market in Pakistan's southwestern city of Quetta on Friday.
Later, Balochistan home minister Mir Zia Ullah Langove said at a press conference that it was a suicide bombing.
"The committee has asked the interior ministry for a briefing over the incident, which has sought some time for it", Senator Malik said.
Pakistani Taliban militants have been waging a campaign of bombings and other attacks on Pakistani security forces.
Protests by dozens of angry Shiite youth from the Hazara community continued Saturday in Quetta for a second day, demanding greater security protection. The same practice was followed on Friday, but the blast took place in the market.
Women and children are among those who have been staging a sit-in since shortly after the blast.
Violence in Pakistan has dropped significantly since the country's deadliest-ever militant attack - an assault on a school in the northwestern city of Peshawar in 2014 that killed more than 150 people, a lot of them children. "Those commitments must translate now into policies to effectively protect the Hazaras of Quetta, ending more than a decade of bloodshed that has scarred their community".
"Emergency has been declared at hospitals and it seems people from the Hazara community were the target", he said.
"The attack took place in a shop". The market serves as a wholesale market for fruits and vegetables.
The National Commission for Human Rights (NCHR) a year ago stated that 509 members of the Hazara community were killed and 627 injured in various incidents of terrorism in Quetta from January 2012 to December 2017.
"The Islamic State's Khorasan Province (ISKP) claimed killing and wounding 70 Hazara Shias and Pakistani soldiers in a suicide bombing in Quetta", it said.