Police filed two cases at the Landhi and Korangi police stations after one person was killed in the violence-marred NA-240 by-election on Friday.
At the Landhi police station, a case has been registered under terrorism and other clauses on the complaint of the presiding officer. According to the first information report, 400-500 people belonging to a political party entered a polling station all at once.
The staff of the polling station were beaten up and election materials damaged, the FIR said. When the ballot boxes were damaged, the police sprung into action, it added.
The case at the Korangi police station was registered on the complaint of a police officer and includes a riot clause. According to the FIR, 20-25 men armed with sticks stood outside a polling station set up at a school.
The police raided the polling station, took five persons into custody and recovered sticks from them, the FIR said, adding that the polling process was then immediately resumed.