Intruders broke into Horsham’s Non Stop Party Shop last night (July 23).
Lorraine Gregory who works at the shop was one of the first people to arrive at the scene where intruders had forced open the lock on the front door.
At this stage staff are unsure whether anything has been taken.
Ms Gregory said: “It has made me really cross. Why would they target a small company like this?”
A spokesperson for Sussex Police said: “Police are investigating a late night break-in at a shop in Horsham.
“An alarm was activated in the Non Stop Party Shop in Middle Street a few minutes before 12 midnight on Wednesday night (July 23).
“The owner and police officers were quickly on the scene and established that although the door of the shop had been broken through, there was no indication that anyone had entered the property or that anything had been stolen.”
Anyone who saw anything suspicious in the area on the time leading up to midnight is asked to email 101@sussex.pnn.police.uk or call 101 quoting serial 08 of 24/07. Alternatively, you can contact the independent charity Crimestoppers anonymously on 0800 555 111.