Two British citizens were critically ill in a hospital on Wednesday after they were poisoned with the Novichok nerve agent, which struck down a former Russian agent and his daughter in March, Britain¡¯s top counterterrorism officer said.

The British pair, a 44-year-old woman and a 45-year-old man, were hospitalized after being found unwell on Saturday in Amesbury, just a few miles from Salisbury, where ex-double agent Sergei Skripal and his daughter, Yulia, were attacked in March.

¡°I have received test results from Porton Down (military research center) which show that the two people have been exposed to the nerve agent Novichok,¡± Neil Basu, Britain¡¯s most senior counterterrorism officer, told reporters.