A man entered a betting shop in Southgate Parade, Crawley around 10.05am on Wednesday (June 5).
He threatened the staff worker and demanded money from the till before fleeing the scene.
Officers attended the premises and conducted an area search but the suspect was not found.
Sussex Police say that all lines of enquiry will be investigated.
Chief Inspector Rosie Ross said:
“All lines of enquiry connected to this incident will be investigated.
“Engagement with the communities is vital and we will continue to educate members of the public about the dangers and consequences of carrying a knife.
“Our message to those who carry a knife or thinking of carrying a knife is that it does not protect you and could actually make you more vulnerable and in danger of serious harm.”
Anyone with information is asked to report online or call 101 quoting 351 of 05/06.
Urgent appeal as £5k reward offered to find violent man who ransacked Crawley shop and assaulted child
Police have launched an urgent appeal and offered a reward of up to £5,000 for information leading to the capture of Jordan Charles.
Charles has links to Crawley and Bexhill in East Sussex as well as Croydon in South London.
The appeal for anonymous information has been launched to urgently find 23-year-old Jordan Charles, who is wanted for questioning over a series of violent incidents in Sussex.
A string of offences in recent months includes: violence and robbery; threatening revellers with a knife in Brighton; using racist and homophobic language; spitting saliva and blood at police; ransacking a takeaway in Crawley and attacking a customer; attacking staff at another Crawley restaurant with a glass and a metal chain dog lead wrapped around his hand; punching and kicking a woman to the floor outside a nightclub; assaulting a 12-year-old girl who had come to the aid of her mother and aunt during a parking dispute.
He has also failed to appear in court.
Jordan Charles is black, about 5’ 9″, of medium build and with black hair. He is known to have links to Crawley, and is thought to still frequent the area.
Glenys Balchin, Crimestoppers Regional Manager said:
“This man must be found before anyone else comes to harm, which is why we are making an urgent appeal to the public in Sussex, Surrey and south London to help find his location. Jordan Charles is dangerous and the allegations against him are serious.
“It is important to remind people that assisting somebody wanted for questioning over a crime can lead to prosecution. We are appealing to anybody who may know the whereabouts of Jordan Charles to urgently tell our charity what you know 100% anonymously. Always. You can call our UK Contact Centre, which is open 24/7, on freephone number 0800 555 111 or you can use our simple and secure anonymous online form.
“Crimestoppers has been taking crime information since our charity was formed over 32 years ago. Every day over a thousand people trust our charity with their anonymous information. Nobody will know you contacted us, only you.”