According to local media, three Croatian nationals have been detained in Serbia after radioactive material was found in their automobile.
Scanners discovered a “significant level” of radiation on Saturday as they were about to enter Croatia.
According to accounts, the head of a radioactive lightning rod was discovered in the spare tire during a later examination of an Audi vehicle.
The three suspects are still being questioned by Serbian authorities.
At 20:30 on Saturday, the event took place at the Bezdan border crossing near the town of Sombor (19:30 GMT).
No information has been provided regarding the quantity of radioactive material involved or its possible effects, but according to Serbian media, workers at the border crossing were instructed to remove their clothing and undergo medical exams as a precaution.
According to reports, specialists from Serbia’s Vinca Nuclear Research Institute moved the lightning rod’s head to a more secure location.