The blast hit as passengers waited on a platform at the main railway station in the provincial capital Quetta.
“Fourteen members of the army and 12 civilians were killed,” said Wasim Baig, spokesman for Quetta’s Sandeman Provincial Hospital, raising an earlier toll of 25 provided by police, AFP reported.
Forty-six members of the security forces and 14 civilians were wounded, the spokesman added.
Despite frequent attacks in Balochistan the toll of Saturday’s blast was particularly high for the southwestern province, which borders Afghanistan and Iran.
Prime Minister Shehbaz Sharif said the attackers “will pay a heavy price”, according to a statement from his office.
The BLA frequently claims deadly attacks against security forces or Pakistanis from other provinces, notably Punjabis.
Iranian Foreign Ministry spokesman Esmaeil Baghaei in a statement on Saturday condemned the terrorist attack, reiterating Tehran’s readiness for bilateral cooperation to counter terrorism.
He said such terrorist attacks are in violation of all legal and human rights principles and rules and are “not acceptable at all.”