Three rocket attacks and a bomb struck parts of western Pakistan on Wednesday, killing five people, including a child, police said.
The rockets hit several busy roads in Quetta, the capital of Baluchistan province, police chief Daood Junejo said.
The province has been a scene of low-level insurgency for years by nationalist groups who want a greater share of revenue from resources in the oil- and gas-rich region. A police officer and a child were among those killed by rockets and 15 people were injured.
Two hours earlier, five gunmen riding motorcycles intercepted three NATO supply oil tankers and torched them in Bolan district, 75 miles (120 kilometers) east of Quetta, said a paramilitary official, Aziz Ahmad. He said the assailants let the drivers go and nobody was injured.
The tankers were carrying oil from the port city of Karachi to Afghanistan.
Earlier, a roadside bomb struck a donkey cart near northwestern city of Peshawar, killing the driver, said police official Ghaffar Khan.
No group has claimed responsibility for the attacks, but Taliban militants have regularly carried out attacks in northwest Pakistan in recent years.