Thed pakistani govt. may not admit but this is an evidence of a civil war. There is unrest, there is opposition to the govt. and the people are killing govt. employees - police in this case.
In NWFP, not just in FATA, the tribals have been fighting the federal paki govt. for seevral years. In Balochistan, the federal govt. is the most hated. In Karachi, the growing population and lack of infrastructure is causing a crime wave including abductions and murders for money. In Islamabad and rest of Punjab, there is chaos galore.
Pakistan, as we know it today, is on the brink of extinction.