Iran Press/ Asia: The explosion, claimed by the Pakistani Taliban group, or Tehreek-e-Taliban Pakistan (TTP) in a text message to Reuters, came after the group ended a ceasefire with the government this week.
"A bomb blast that targeted a police patrol," a police official, Abdul Haq, told Reuters. "Out of the casualties, a policeman, a woman and a child died."
The patrol had been guarding a polio vaccination team at the time of the suicide blast, he added.
Polio vaccination teams are often targeted in Pakistan, in the belief that the immunisation effort is a Western tool to spy on them.
Quetta is the capital of Pakistan's province of Balochistan.
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