Oliver Barcenas, an employee at a navigation center, was arrested by federal authorities on courthouse steps. He is accused of aiding an alleged gunman who shot a police officer. Barcenas was scheduled to appear at his arraignment on Wednesday but did not attend.

The reason for his absence is that he was taken into custody by federal agents. Further details about the case and the circumstances surrounding his arrest are available from the source.

The arrest of Barcenas is related to his alleged role in assisting the person who shot the police officer, but specific details about the incident and the charges against him are not provided here.