Yulia and her father were targeted in a nerve agent attack in Salisbury almost a month ago

A former Russian spy's daughter is "improving rapidly" and is now in a stable condition.

It comes almost a month after Sergei and Yulia Skripal were poisoned with a nerve agent in Salisbury, England more than three weeks ago.

An update from the local NHS Trust says Sergei (66) remains critical but stable, while Yulia's (33) condition is no longer critical.

Dr Christine Blanshard, Medical Director for Salisbury District Hospital, said: “I’m pleased to be able to report an improvement in the condition of Yulia Skripal.

"She has responded well to treatment but continues to receive expert clinical care 24 hours a day."

Dr Blanshard added she was "very proud both of our front-line staff and all those who support them" for their work treating the two patients.

The investigation into the poisoning is now focusing on the front door of Sergei's home, where police say the highest concentration of the nerve agent has been detected.

Officials have said the investigation around the Skripal home is likely to take weeks or possibly months to complete.