An Avon & Somerset police spokesman said: “The incident happened on Station Avenue at around 7.30am on Wednesday 18th March.
“A small drone was seen flying close to windows of a building on Station Avenue. We would like to speak to a man who may have information about the incident. He was wearing white trainers, jeans, a red jumper and a black jacket with grey collar and details.
“We would like anyone who recognises him or has any information about the incident to contact us.”
Contact Crimestoppers anonymously on 0800 555 111 or call 101, quoting reference 29418/15.