WASHINGTON PARK, Ill. (AP) — Two people who authorities had described as "persons of interest" in the shooting death of Washington Park's mayor have been released without charges.

Illinois State Police Lt. James Morrisey said Saturday that no charges have been filed, and the investigation is continuing.

More on Mayor's Death: Illinois Mayor John Thornton Murdered

Police say 52-year-old Mayor John Thornton was shot three times at close range while sitting in his car early Thursday. He was returning home from a second job.

The two persons of interest were taken into custody later Thursday. Authorities have refused to discuss a possible motive.

Funeral arrangements for Thornton were pending with L. King Funeral Chapel in Belleville.

Washington Park is a small village about 10 miles east of St. Louis.