The first bomb planted on a roadside exploded when a police petrol vehicle passed in Aslam Dheri neighbourhood of the city.
The second blast came some 20 minutes later, as police, rescuers and others were trying to help the casualties.
"A policeman embraced martyrdom and three others were wounded in two bomb blasts," senior police official Sajjad Khan told AFP.
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SSP Abbas Majeed confirmed the attack, saying three policemen were among those injured.
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Rescue 1122 officials claimed to have shifted six injured to the hospital.
A DSNG van of Express News and Rescue 1122's vehicle were also damaged in the blasts.
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