Three men have been arrested in the United Kingdom on suspicion of spying for China. The arrests were part of a counter-terrorism policing investigation.

The men, aged 39, 43, and 68, were taken into custody in London and Wales. Authorities confirmed the investigation falls under the National Security Act.

One of the detained individuals is reportedly the partner of a Labour Member of Parliament. This detail was confirmed by sources.

The Metropolitan Police announced the arrests in a statement. Further details about the investigation were not immediately released.