A group of unidentified men had forced polling staff to vacate the station at 11am.
Boys under the age of 11 were seen stamping the Bat symbol on ballot papers in the NA-242 and PS-96 constituencies.
Reports of rigging and polling delay have come from all across Karachi.
Eyewitnesses also reported that rigging was taking place in NA-255, PS-122.
Polling continues in NA-241
Despite reports of rigging from nearby constituencies, polling continued smoothly in areas of NA-241.
Activists of the Jamaat-e-Islami (JI) were announcing on loudspeakers that their candidates had not withdrawn and that it was a conspiracy.
Voter turnout is low in the constituency so far.
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