Brazilian police pulled former President Luiz Inacio Lula da Silva and two of his sons in for questioning and searched homes and other buildings connected to the family, drawing the country’s most towering political figure closer into the sprawling corruption case centered on the oil giant Petrobras.

Police turned up early Friday morning at addresses belonging to Silva, including his residence near Sao Paulo and the Instituto Lula, his nonprofit organization, police said in a news conference in the southern city of Curitiba, where the Petrobras probe is centered.