"Data received till 12 pm from all the constituencies where the by-poll is being held today suggests an average 18-19 per cent voter turnout," a state election official said.
The two Lok Sabha seats are Porbandar and Banaskantha, while the assembly seats are Dhoraji, Jetpur, Limbadi and Morva Hadaf.
Jetpur, Dhoraji and Limbadi assembly seats registered 23 per cent, 16 per cent and 35 per cent voting till 12 pm respectively, additional chief electoral officer Ashok Manek told PTI adding that Morva Hadaf (reserved for ST) assembly seat registered 30 per cent voter turn out.
The voting began from 7 am and no untoward incident has been reported so far, the official added.
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In view of the heat conditions, the Election Commission has extended the polling time for the by-elections. Voting will continue till 6 pm instead of usual 8 am to 5 pm.
Former Congress MP Vitthal Radadia and his son Jayesh, who joined BJP, will test the political waters from Porbandar Lok Sabha seat and Jetpur assembly seat respectively.
The by-polls in Gujarat are being viewed as test for the opposition Congress, ahead of the 2014 general elections, as the party had won all the six seats in last elections.
The counting will take place on June 5.