The NWFP police and federal intelligence agencies have failed to identify the cause behind bomb blasts and suicide attacks in the province, which has seen a number of attacks in recent months that have heightened tensions between the provincial and federal governments. It is not clear who is behind the bombings in Peshawar – the most serious of which killed at least nine people in October 2006. Police have set up checkposts within the city and its suburbs, but they have not made any arrests or managed to control terrorist activities. Police sources said that only one step had been taken to identify the cause of blasts and suicide attacks – the formation of investigation committees – but “we have not seen any reports on the cause of these disturbing events yet”. The province witnessed eight blasts and the murder of a senior police officer during the last quarter of 2006.