The van carrying 30 people was heading towards Peshawar from Parachinar when it was attacked.
A group of about 50 heavily armed Taliban militants attacked Pakistani troops while they were conducting a search operation.
Sectarian violence in Pakistan's volatile tribal Kurram Agency began last weekend.
In Pictures: The LG X Screen Smartphone With Dual Display
Get a Glimpse of Olympic Village at Rio
West Indies vs India, 1st Test, Day 2
'Madaari' Vs 'M-Cream', What's Your Pick This Week?
India Couture Week 2016: Manish Malhotra Recreates the Magic of Persia
CNN name, logo and all associated elements ® and © 2016 Cable News Network LP, LLLP. A Time Warner Company. All rights reserved. CNN and the CNN logo are registered marks of Cable News Network, LP LLLP displayed with permission. Use of the CNN name and/or logo on or as part of NEWS18.com does not derogate from the intellectual property rights of Cable News Network in respect of them.
© Copyright Network18 Media and Investments Ltd 2016. All rights reserved.