LONDON (AP) — Nerve agent victim Charlie Rowley has been released from the hospital after three weeks of treatment since being poisoned, U.K. officials said Friday.

Lorna Wilkinson, the director of nursing at Salisbury District Hospital, said Rowley, 45, had been discharged after making substantial progress in recent days.

"Charlie has been through an appalling experience most of us could never imagine," she said. "Today is a very welcome milestone in his recovery."

Officials say Rowley and his partner Dawn Sturgess fell ill June 30 after being exposed to the nerve agent Novichok when they handled a container thought to have been used in the March nerve agent attack on ex-Russian spy Sergei Skripal and his daughter Yulia.

Sturgess, 44, died in the hospital on July 8.

Novichok was produced by the Soviet Union during the Cold War. Britain has blamed Russia for poisoning the spy and his daughter, who both recovered after lengthy hospitalizations, as well as accidently poisoning Rowley, Sturgess and a police officer who aided the Skripals.

Russia has denied the charges. The poisoning of the spy ignited a diplomatic scrum in which hundreds of envoys were expelled from Russia and Western nations.

The nursing director said "many people" had come to the hospital concerned about possible exposure to Novichok but that only the five victims already identified had been exposed to the lethal nerve agent.

Wiltshire Police Chief Constable Kier Pritchard said police will work with local agencies to make sure Rowley gets the support he needs as he continues to recover.

British officials have taken the Skripals to a secret location for their own protection.