Police have published footage on YouTube of armed men in clown and Halloween masks robbing a jewellers in Wigan.
The three robbers, armed with crowbars and a hammer, threatened people in the shop and ordered two men to get on the floor before taking a large amount of jewellery last week.
One of the men was wearing a clown mask with a red curly wig, the second man was wearing a Halloween-style mask with a white dreadlock-type wig and the third man was wearing what was believed to be a clown mask with a black curly wig.
They were also carrying charity collection buckets.
Detective Inspector Martin Reddington from Wigan CID said: "These men have terrified staff and customers, including a pregnant woman, as they carried out this robbery dressed in horror style masks and armed with weapons."