More than 600 artefacts "of significant cultural value" have been stolen from Bristol Museum's archive in a "high-value" raid, police say.

Four men gained entry to a building in the Cumberland Basin area of the city in the early hours of 25 September, Avon and Somerset Police said.

Items from the museum's British Empire and Commonwealth collection were stolen and detectives are now trying to trace four men captured in the area on CCTV.

"The theft of many items which carry a significant cultural value is a significant loss for the city," Det Con Dan Burgan said.

"These items, many of which were donations, form part of a collection that provides insight into a multi-layered part of British history, and we are hoping that members of the public can help us to bring those responsible to justice," he added.

"So far, our enquiries have included significant CCTV enquiries as well as forensic investigations and speaking liaising with the victims."

Police are keen to speak to anyone who recognises the men captured on CCTV, or who may have seen possible stolen items being sold online.

All of the men are thought to be white. The first was described as of medium to stocky build and was wearing a white cap, black jacket, light-coloured trousers and black trainers.

The second was described as being of slim build and was wearing a grey, hooded jacket, black trousers and black trainers.

The third was wearing a green cap, black jacket, light-coloured shorts and white trainers. Police said he appeared to walk with a slight limp in his right leg.

The fourth was described as being of large build and was wearing a two-toned orange and navy or black puffy jacket, black trousers and black and white trainers.