Alejandro Toledo, 64, Peru's president from 2001 to 2005, has announced another run for the office via Twitter.
He faces a crowded field including Luis Castaneda, Lima's mayor ; Keiko Fujimori, the daughter of disgraced and imprisoned ex-President Alberto Fujimori; leftist former candidate Ollanta Humala; and, recently announced Mercedes Aráoz, the ex-finance minister in the García administration.
Toledo's government was troubled by scandal and corruption as well as his initial refusal to acknowledge the existence of his daughter Zaraí.