Police are investigating two armed robberies in King's Lynn and Downham Market.

Eastern Daily Press: Police Forensics were at the shop on King's Lynn's High Street. Photo: Emily PrincePolice Forensics were at the shop on King's Lynn's High Street. Photo: Emily Prince (Image: Archant)

Officers were called to the JD Sports store in Lynn High Street at around 9.55am after a man entered the store and threatened a female staff member with a knife before he stole trainers, gloves and clothing.

Shortly before 10.30am officers were called to Lynn Road in Downham Market after a man was threatend with a knife at a petrol station, by a man who drove off with his care.

The red Vauxhall Corsa, registration RA12 TGU, was last seen heading south on the A10 towards Ely.

One man, who has worked at the Jet petrol station on Low Road for 19 years, said it was the first time anything like this had happened at the business.

Eastern Daily Press: JD Sports, King's Lynn was closed this morning due to unforeseen circumstances. Photo: Emily PrinceJD Sports, King's Lynn was closed this morning due to unforeseen circumstances. Photo: Emily Prince (Image: Archant)

'It was all over in two minutes,' he said. 'I didn't have time to feel scared. 'A man was dropped off by a taxi and went up to a customer with a knife. There was some arguing between the two men but then I saw the customer take his house key off the car keys and the man got in the car and drove it away. The customer came in, shaken and I called the police.'

Mayor of Downham Market, David Sharman said: 'I am horrified, it's so unsual for Downham Market to have anything like this, to my knowledge it's never happened in Downham before. I hope we don't have any repetition of it.'

Jonathan Toye runs West Norfolk Disability Information Service (WNDIS) and lives opposite the Jet petrol station said: 'It's usually a very quiet and peaceful road, the people who work in the garage are lovely, it's not that sort of road.'

No one was hurt in either incident. Anyone with information should contact King's Lynn CID on 101.

Police later said a man in his 20s had been arrested in London in connection with the incidents and would be brought back to Norfolk for questioning.