Speaking to reporters after voting, Modi underlined the need to combat terrorism, saying voter identification cards were democracy’s “weapon”.
In all, 188 million Indians are eligible to vote in 117 constituencies during the day, across 15 states and federally controlled territories. India’s parliament has 545 members.
Nearly 24 percent of those eligible had voted as of 12 p.m. (0630GMT), India’s election commission said.
The general election, which has seven phases, began on April 11 and will end on May 19. Votes will be counted on May 23.
(Production: Shane Tietjens, Lewis Macdonald)