Every ballot paper has an anti-fraud segment that officials have to rip off before placing them into the ballot boxes.

After leaving the booth, the voter must hand the folded ballot papers to the polling station staff who must check that the anti-fraud code on the ballot paper matches the one assigned before voting.

Italy's first autumn national election in over a century was triggered by party infighting that brought down Prime Minister Mario Draghi's broad national unity government in July.

Polls close at 11.00 p.m. (2100GMT).