Police confirmed the ball has a diameter of around 1.5 meters, and is believed to be made of iron and coated in rust.

As a safety precaution, authorities restricted access within 200-metres of the object of “unknown origin”.

The stretch of the beach was closed off for most of the day while bomb squads got to work.

An X-ray determined the object was hollow and there was no danger of explosion.

Restrictions were lifted at around 4pm.

The sphere was spotted by a woman walking on the beach with her husband

The sphere was spotted by a woman walking on the beach with her husband (Image: Twitter/nhk_shizuoka_)

However, cops were still uncertain about what the particular object is, or what its purpose is.

The bizarre discovery prompted a wide range of speculation, with some users online linking it to the alleged ‘spy’ balloons which have been sighted across North America this month.