Just two days after terrorists attacked the Brussels airport and subway system, a security guard for a Belgian nuclear facility was murdered and his security access badge was stolen, Belgian media reported Saturday.

The security guard’s badge was de-activated as soon as it was discovered it was stolen, according to French newspaper Derniere Heure.

He was shot dead in the Charleroi region of Belgium as he walked his dog, International Business Times reported.

On Thursday, Derniere Heure reported that the suicide bombers who set off explosives that killed 31 people were originally targeting a nuclear site, but a series of arrests of suspect militants, including suspected Paris attacker Salah Abdeslam, forced them to speed up their plans.

Last year, a senior nuclear industry official was secretly filmed by militants. It is suspected that they planned to abduct him to obtain information about radioactive materials.

Belgium remains on high alert after the terrorist attacks, and France has also stepped up security at many of its nuclear power plants, with workers being screened for Islamist sympathies, according to the Telegraph.

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