Zodiac Killer-esque signs appear in Chesterfield

However, there's no need for panic as it's understood workmen have painted the cross-circle symbols on the ground so they can carry out certain tasks in the area.

The self-proclaimed Zodiac Killer operated in northern California in the late 1960s and early 1970s

He was directly linked to at least five murders and may have been responsible for more.

The Zodiac Killer sent menacing letters to police and newspapers in the San Francisco area. Each closed with a symbol consisting of a circle with a cross through it.