By Hamid Ullah Khan
PESHAWAR, Pakistan, Sept 29 (Reuters) - A bomb blast in the northwestern Pakistan city of Peshawar killed 31 people and wounded 70 on Sunday, a week after a bombing at a church in the frontier city killed scores, police and hospital authorities said
Islamist violence has been on the rise in Pakistan in recent months, undermining Prime Minister Nawaz Sharif's efforts to tame the insurgency by launching peace talks with the Taliban.
Sunday's blast was outside a police station in Peshawar in an area crowded with shops and families. There was no immediate claim of responsibility.
The casualties were confirmed by police and by Arshad Javed, a doctor at Lady Reading Hospital in Peshawar.
It follows an attack by a Taliban faction on Peshawar's Anglican church last Sunday that killed more than 80 people, the deadliest attack on Christians in predominantly Muslim Pakistan.
The Taliban have repeatedly rejected Pakistan's constitution and have called for the full implementation of Islamic law and for war with India.
Sharif is due to meet Indian counterpart Manmohan Singh on the sidelines of the United Nations General Assembly later on Sunday, only hours after Singh described Pakistan as the "epicenter of terrorism in our region". (Additional reporting by Saud Mehsud in Dera Ismail Khan; Writing by Katharine Houreld; Editing by Paul Tait)