The assailants had surrounded the station, firing at it from all sides.
Police officials said that a passerby child had been shot in the head and was severely injured.
Four to five explosions had been heard in the area.
During the day, six people, including a woman, had been killed in different acts of violence in the city.
A Muttahida Qaumi Movement (MQM) worker was shot dead in Ranchor Line, after which sporadic firing in the area forced shops to close business for the day.
Two bodies of a man and a woman, were found in the bushes near a mausoleum in Surjani Town.
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