Police are investigating after more than 600 artifacts were stolen from an English museum.

According to the Avon and Somerset Police , a group of four males broke into a building on Cumberland Road in Bristol between 1 a.m. and 2 a.m. on Sept. 25.

The building housed items from the Bristol Museum’s British Empire and Commonwealth collection. It’s unclear why police are now seeking public help more than two months after the crime.

“The theft of many items which carry a significant cultural value is a significant loss for the city,” said DC Dan Burgan.

“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.”

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