Robbers broke into a family home in Leeds and held a knife to a woman's throat as her children played downstairs.
The terrifying home invasion took place in Hollin Hill Avenue, Oakwood, on Thursday, February 23, at about 11.30am.
A picture taken by a neighbour shows the masked men making their escape with a quantity of high value Asian gold jewellery.
Detective Constable Ian Chapman, of Leeds District Crime Team, said: "This was clearly a terrifying experience for the victim and her children to be confronted in their home by two masked men armed with a knife.
"We are treating the incident very seriously and carrying out extensive enquiries to trace these men."
The duo had entered the house through a window and approached two young children who were playing downstairs.
They told the children to be quiet, before making their way upstairs and confronting their mother.
The men then held a knife to the woman's throat and forced her to open a safe containing the jewellery.
Both suspects kept their faces covered, but they were described as black men.
Det Con Chapman said: "We appreciate that they have their faces covered on the image we have released but we hope someone may recognise their clothing and face coverings as items linked to known individuals."
Anyone with any information is asked to contact Det Con Chapman at Elland Road via 101, quoting crime number 13170083999.
Information can all be passed on to the independent charity Crimestoppers anonymously on 0800 555 111.