New Delhi, India: Prime Minister Narendra Modi faces his first state election defeat since sweeping to power last year, according to exit polls on Saturday which showed a resurgent anti-corruption party, the Aam Aadmi Party (AAP), on track to win a majority in New Delhi's assembly.

A defeat for Modi's Bharatiya Janata Party (BJP) in the Indian capital would harm his chances of consolidating power in parliament, where his reform agenda is being thwarted.

Modi needs to win most of the state elections over the next four years to gain control of both houses of parliament to deliver on his promise of jobs and economic growth.

The upper house, where his party is in a minority, is frustrating his efforts to pass laws related to tax and foreign investment.

The anti-corruption Aam Aadmi Party, or Common People's Party, is likely to win 38 seats in the 70-seat New Delhi assembly, according to the average of four opinion polls released on Saturday after the voting had ended.

The official results will only be published next Tuesday.

The BJP is expected to win 29 seats and Congress, the party that has dominated Indian politics over the last century, will win three seats, its worse ever performance, the polls showed.

The BJP's campaign has been marked by infighting with party workers frustrated that Kiran Bedi, the first woman officer in the Indian Police Service, was appointed as the party's chief ministerial candidate, even though she only became a party member three weeks ago.

Earlier this week, the BJP ordered scores of its top national and state leaders to campaign for this weekend's high-profile election to the Delhi assembly.

Modi took out full-page advertisements on the front of several major newspapers in the capital on Friday in a last-minute effort to sway voters.

The BJP, which under Modi won India's biggest election mandate in three decades last May, has come first in three of four state elections over the past year. It may also form a coalition government in the fourth regional assembly.