GRAND RAPIDS, MI - A Grand Rapids police officer has resigned while under investigation by the Internal Affairs Unit over his actions during the arrest of a robbery suspect, police said Monday, Sept. 18.

The officer's name was not released. He was suspended Sept. 12.

He had been on paid administrative leave before he resigned during the course of the investigation, Lt. Terry Dixon said.

Colleagues reported the officer's actions which occurred during the arrest of an armed-robbery suspect.

"During the arrest, fellow officers observed actions by the suspended officer that were not consistent with training or standard procedures," Dixon said in a statement.

He declined to disclose specifics of the allegations but said the investigation centered on use of force.

The suspect was reported to have had a gun during the robbery.

The internal investigation continues, police said.