Prosecutors say they intend to question uncooperative Cleveland police officers as hostile witnesses at the trial of an officer accused of firing the final rounds of a 137-shot barrage that killed two unarmed suspects in 2012.

Officer Michael Brelo's trial on two counts of voluntary manslaughter is scheduled to start April 6. Prosecutors say Brelo fired his last 15 rounds after the car stopped moving and the suspects were no longer a threat.

Prosecutors filed a motion late Monday that says most subpoenaed officers have refused requests for pretrial interviews. The motion says the refusal shows that a police union continues to impede Brelo's prosecution.

If the judge were to declare a witness hostile, the prosecution would be allowed to suggest answers to questions normally asked during cross-examination.