Iran Press/ Asia: The blast happened in Balochistan province when the officers were returning to the provincial capital Quetta after policing a festival.
Images show a police truck crushed and overturned, with blood stains on the ground.
This is the second attack on security forces in Balochistan within 24 hours. No group has claimed responsibility.
Kachhi district's Deputy Police Commissioner Sami Agha confirmed that it was a suicide attack.
Reuters reported that the attacker rammed a motorbike into the truck.
The Balochistan government has condemned the attack and said that an investigation is underway.
The blast Monday was the third major attack against Pakistani security personnel in as many months, highlighting the rapidly deteriorating security situation in the country.
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