According to residents in Little London, they saw a 'great, big' drone flying in the area for at least 45 minutes and reported the incident to the police.
Sussex Police confirmed it received a report of a drone being flown in Shippam Street at around 10.55am.
One woman said: "It was very big and looked like a professional drone. It was made of steel and was shining red and green lights.
"It was definitely looking into my apartment, and other nearby homes."
Tangmere resident Helen Perry said she and her daughter also saw the drone 'hovering over TK Maxx'.
She added: "I said at the time about how big it was.
"I couldn't make out if it was there for a training exercise or something similar."
Did you see the drone? Let us know by calling 01243 534166 or commenting on our Facebook page.