ABOUT 500 people were recently evacuated from the Swedish Security Service in the municipality of Solna following a suspected gas leak last week.
Authorities found traces of a colorless and toxic gas identified as phosgene, used as a weapon during World War I.
The poisonous gas emits a strong odor that can cause vomiting and breathing problems.
Eight people have been hospitalized, with most of them having experienced breathing difficulties.
No severe injuries have been reported.
