St. Joseph Police are investigating after an explosion Tuesday morning on 22nd Street.

According to Capt. Jeff Wilson with the police department, a call came in shortly before 9 a.m. Tuesday about an explosion in the 600 block of S. 22nd Street. According to witness statements, an explosive device put into the sewer blew the lid and concrete cover off and into the street.

Wilson said no one was injured.

Police have not identified the explosive device yet. Wilson said there is no suspect in custody as of early Tuesday afternoon, but the investigation is progressing.