Israel’s top-secret nuclear research facility near the southern city of Dimona is undergoing a major expansion, according to a British report.

The UK’s Guardian newspaper reported the development on Thursday, saying the construction work is visible in satellite imagery published by an independent expert group.

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The section of the complex under construction is several hundred meters (yards) from the complex’s reactor and reprocessing plant, and the purpose of the construction is not known, the report said.

Read more at Times of Israel.