"The attackers were wearing uniforms from the paramilitary Frontier Corps", said provincial home secretary Haider Ali while talking to AFP.
The assailants checked the identity cards of passengers and offloaded 16 of them.
The bodies were shifted to Ormara Hospital for medico-legal formalities.
". those who were targeted carried [identification] cards of the Pakistan Navy and Coast Guards, and they were only killed after they were identified", the spokesperson for the Baloch Raaji Aajoi Sangar (BRAS) said in the statement, al jazeera said.
The incident spread panic and fear among dwellers of the region and are unwilling to speak to the police investigating into the incident.
The motive behind the killings and the identity of the victims yet to be ascertained. No one has claimed responsibility for the killings.
Langove did not specify how the passengers were selected to be kidnapped and killed or their identities. Baluch separatist groups target people from other ethnicities, and the Islamists mostly minority Shi'ite.
He termed the attack as "an act to build a conspiracy to halt progress in Balochistan and tarnish the state's image".
Those who were not from Balochistan were marched off the bus and shot dead. The attack drew nationwide condemnation and Prime Minister Imran Khan called it "an act of terror". He also prayed for eternal peace of the departed souls and forbearance of the bereaved families.
He vowed that the progress would continue despite of such cowardly attacks, and terrorism would be eradicated from the region.
President Dr Arif Alvi condemned the terrorist attack and expressed profound grief and sorrow at the loss of precious human lives in the incident. He said "the nation was united and steadfast in its fight against terrorism". Balochistan Inspector General of Police Mohsin Hassan Butt said what happened on Makran Coastal Highway was a "targeted killing".
Fourteen people were killed by the assailants. The PPP chairman demanded that the government bring the perpetrators of the tragedy to justice.