A Detroit police officer looks over one of the plate glass windows that was hit inside the precinct building in northwest Detroit where a gunman walked into the police station and opened fire injuring four police officers on Sunday. The gunman was killed. (Associated Press)

A Detroit police officer looks over one of the plate glass windows that was hit inside the precinct building in northwest Detroit where a gunman walked into the police station and opened fire injuring four police officers on Sunday. The gunman was killed. (Associated Press)