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An investigation is under way after a couple were exposed to novichok in Amesbury, Wiltshire.

Dawn Sturgess, 44, was taken ill at a house in Muggleton Road on Saturday morning, followed by her partner Charlie Rowley, 45, from the same location later in the day.

Amesbury town is roughly eight miles (13km) from Salisbury, where former Russian spy Sergei Skripal and his daughter Yulia were targeted with the nerve agent in March.

A number of places in Salisbury and Amesbury remain cordoned off.

Here are the investigation points.

House in Muggleton Road, Amesbury

Police were called to Mr Rowley's flat on Muggleton Road on Saturday morning, after Ms Sturgess collapsed.

The home, which is on a new housing development on the southern edge of Amesbury town, lies close to Stonehenge.

Later that day police were called to the property again to attend to Mr Rowley, who had also fallen ill.

Resident Chloe Edwards, 17, described seeing police cars, fire engines and people in "green suits" on Saturday night.

She said the vehicles arrived at about 7pm and she and her family were told to stay inside their home until about 10pm.

"We saw everything... We were just eating our dinner and all these emergency vehicles turned up.

"They were putting on these green suits and we thought it was the gas as our electricity was turned off as well."

Amesbury Baptist Centre

About a mile from the house is Amesbury Baptist Centre. Roy Collins, the secretary of the church, saw Mr Rowley and his friend Sam Hobson at a community fundraiser there in the hours after Ms Sturgess was taken ill.

None were described as regulars at the centre. Mr Collins said 200 people attended the event, including many families and children, but "nobody else has suffered any ill effects".

"We are all quite puzzled and shocked," he said. "Naturally the connection with Salisbury and recent events there mean there is a heightened public interest."

Mr Hobson told The Guardian that, after Ms Sturgess was taken to hospital on Saturday morning, he accompanied Mr Rowley to run some errands in Amesbury and the pair then attended a free hog roast at the baptist church.

Queen Elizabeth Gardens

Queen Elizabeth Gardens, in Salisbury, is also being investigated.

Mr Hobson said he had visited the park - known locally as Lizzy gardens - with the couple on Friday, having a drink and enjoying the sunshine.

The gardens are about 10 miles away from the house on Muggleton Road and close to Salisbury city centre, where the Skripals are believed to have been poisoned.

On Wednesday morning, a large section of the road near the park was cordoned off and a blue forensic tent was set up.

Harcourt Medical Centre

Right by Queen Elizabeth Gardens is the medical centre.

It was included in the cordon, but staff said tape was removed on Thursday morning and that no police had been inside. Local media reported it was still open for appointments.

Property at John Baker House

Police have cordoned off a property at John Baker House - a supported housing scheme in Rolleston Street, Salisbury, for homeless people.

It is understood that Ms Sturgess had links to the supported accommodation.

It is located about half an mile from the Zizzi restaurant where the Skripals dined before becoming ill.

Boots

Two police officers have been guarding a Boots store, which was closed as part of the investigation.

It is understood that Mr Rowley and Mr Hobson visited the store after Ms Sturgess became ill.

Patients trying to get their prescriptions filled have been turned away. Amesbury resident Coral said she was directed to another store.

"It's concerning," she said.

Another resident spoke of her concerns, saying: "We all asked straight away 'what is it?' After Salisbury, that was a nightmare, I don't know if this is the same or not."

Shopkeepers said police entered the Boots at about 8.30am and were not in protective clothing.

Porton Down

Samples of the substance are being sent to experts at government chemical weapons research laboratory Porton Down, five miles away.

It is the same facility that identified the substance used in the Skripal poisoning as novichok.

A Downing Street spokesman says the incident is being treated "with the utmost seriousness".