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"Yes the death toll was expected to rise to 40 plus as it was a huge blast amongst the gathering of the mourners," a police official told APP.
The funeral prayers for wife of Hakim Khan, a member of Amn (Peace) Committee was in progress when the suicide bomber ripped through the mourners killing more than 30 besides injuring dozens of others.
Eye witnesses said that the bomber was on foot while entering the Janazagah.
Emergency has been declared in the hospitals where the injured are being brought for medical treatment.
Peshawar-Kohat road has been closed for all kinds of traffic.
Over 20 injured including women and children have been brought to Lady Reading Hospital Peshawar in critical condition.