The accident occurred due to overspeeding, said police adding that women and children were among the deceased. The ill-fated bus was traveling from Turbat to Quetta.
Soon after the incident, the rescue officials reached the site and shifted bodies and the injured to the Basima Civil Hospital.
Rescue sources said the death toll in the Washuk bus accident might rise further as the majority of the injured were in critical condition.
Prime Minister Shehbaz Sharif has expressed deep grief and sorrow over the tragic traffic accident in the Washuk district of Balochistan.
“We stand with the bereaved families in this difficult time,” he said in a statement.
The prime minister also directed to provide all possible medical aid to those injured in the accident.
In a similar incident on May 21, at least 20 persons died and 21 more were wounded when a bus fell into a deep ravine in Diamer, a city in Gilgit-Baltistan province.
The accident occurred on the Karakoram Highway in the Yashukhaldas area of Diamer. The bus was traveling to Hunza from Rawalpindi when it fell into a gorge after the driver lost control.
The bus was carrying more than 35 passengers to Hunza.