Polling is underway in the four Lok Sabha seats of Aurangabad, Gaya, Nawada and Jamui.
Before the start of polling, one cane bomb was found at polling station number 9 at Anarban Sulaiya village under Dumariya assembly constituency of Aurangabad Lok Sabha seat.
Polling will end at 6 pm in most of the booths. In some "sensitive" booths, however, voting will end at 4 pm.
Assembly bypoll for Nawada is also being held along with the Lok Sabha poll on Thursday. A voter turn out of nine per cent has been recorded there till 10 am, the CEO office said.
Bihar will witness a seven-phase polling for its 40 Lok Sabha seat.
The elections which began on April 11 will end on May 19 when the seventh and last phase will be held.
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