Hundreds of people marched in Peru's capital Tuesday night for the second time in under a week to protest the presidential candidacy of the daughter of imprisoned former leader Alberto Fujimori.

Center-right politician Keiko Fujimori is leading in polls ahead of next month's presidential election.

Opponents are demanding she be disqualified on allegations of vote-buying after one of her strongest rivals was tossed from the race last week by electoral authorities in a ruling questioned by international observers and President Ollanta Humala.

Around 2,500 people marched in downtown Lima. Some held signs reading "No More Fujimori."

The elder Fujimori is imprisoned for authorizing death squads and corruption committed during his decade-long rule in the 1990s. His daughter narrowly lost the 2011 presidential race to Humala.