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The threat letter was sent as a postcard. The card stated bombs would be planted in three venues of the state government's public outreach programme.
No group has claimed responsibility for the attack, but previous such attacks have been blamed on Baloch insurgents and Islamic militants.
The bombing was the deadliest in a decade to hit Peshawar.
The attack, in the Police Lines district, was the deadliest in a decade to hit the northwestern city near the Afghan border and comes amid a surge in violence against the police. No group has claimed responsibility.
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