IOWA CITY (AP) — Two black men wrongly convicted in the 1977 murder of a white Iowa police officer hope to prove something they couldn’t during trials that sent them to prison for 25 years: that detectives framed them to solve a high-profile case.

During a civil trial that starts Wednesday in Des Moines, Terry Harrington and Curtis McGhee will argue that Council Bluffs police officers coerced witnesses into fabricating testimony against them in the killing of John Schweer.

Schweer was found dead while working as the night watchman at a car dealership. Harrington and McGhee, then teenagers from neighboring Omaha, Neb., say detectives used threats against a group of young black car theft suspects to trump up evidence targeting them because of their race and pressure to solve the retired captain’s killing.