Advocates for changes in New Orleans' criminal justice system plan a news conference to discuss their request that the U.S. Justice Department look into wrongful convictions.

Among those set to attend Tuesday's event is activist John Thompson, who spent 14 years on death row before he was exonerated in a 1984 murder case.

Thompson and others plan to call on the Justice Department to investigate. They claim authorities at the state and local levels have failed to address widespread prosecutorial abuses.