The attack on the mosque Friday took place in Hangu town, also in Khyber Pakhtunkhwa province.

WSJ: Militants Kill 23 at Pakistan Army Camp

Security personnel and civilians are thought to be among those who died in the attack in Hangu.

BBC: Attacks in Pakistan's north-west 'kill at least 19'

Hangu is a Sunni majority town, but is located on the main route to the mainly Shia Kurram region.

BBC: Pakistan bomb: 21 die in Hangu Shia suicide attack

Karachi, meanwhile, is some 1, 350 kilometers (840 miles) south of Hangu and 800 kilometers (about 500 miles) from Quetta on Pakistan's southern coast.

CNN: March 3, 2013 -- Updated 2051 GMT (0451 HKT)