A local leader of the Awami National Party (ANP), Haroon Bilour, was among those killed in the attack in the city of Peshawar late on Tuesday.
Afghan police on Sunday launched a search and rescue operation two days after at least 70 villagers were kidnapped by suspected Taliban militants in the southern Afghan province of Kandahar.
At least 10 Afghan soldiers were killed when militants attacked their army base in the southern province of Kandahar, the defence ministry said on Tuesday, in the latest attack on Western-backed forces.
Six Pakistanis working for a Polish oil company who were kidnapped by Taliban militants in November pleaded for their lives in a video released on Tuesday by a militant faction.
A suspected US drone strike killed several Pakistani Taliban militants in North Waziristan close to the Afghanistan border, one militant commander and multiple intelligence sources said on Thursday.
Pakistan on Monday ordered the border with Afghanistan to be reopened "immediately", a month after it was closed amid soaring tensions as Islamabad and Kabul accused one another of providing safe haven for militants.