Gunmen killed 10 people, including 9 foriegners, at a hotel in northern Pakistan on 25 June 2013, declaring it was in retaliation for the U.S. drone killing of their second-in-command.
Pakistan is a Muslim country in the midst of severe sectarian violence. Most of the laws reflect one or both of these things and the enforcement of them tends to be related to both as well.
Trekking and Mountain climbing in the Gilgit-Baltistan Area, in Northern Pakistan is quite popular and mountaineers, mountain climbers, and trekkers from all over the world come to visit the area with the highest concentration of the highest peaks in any area in the world.
The flooding of many parts of Pakistan has led to an outbreak of many forms of water-borne diseases, with diarrhoea and related diseases being quite common.
Getting around in Pakistan is more than slightly problematic. It is advised that you not use public transport of any form and taxis in particular should be ruled out completely.
There is a very high rate of crime in Pakistan, particularly as regards serious violent crime including armed robbery, robbery, carjacking, kidnappings, home invasion and murder are all common in major urban areas.
Terrorism and outright sectarian violence is a very real and present threat in Pakistan, and the threat of terrorism should be considered to be very high.
Pakistan is currently in a general state of unrest, and you are advised not to travel to Pakistan at all, as the risk of violent outbreaks should be considered as "occurring" rather than potential.