Police are appealing for information following a vicious armed robbery at a Brunswick jewellery store in April.

Investigators have been told four men confronted staff in the Sydney Road store on Thursday 14 April just after midday.

It appears the men were posing as customers before they attacked the male and female store attendants, who are husband and wife.

The 49-year-old woman and the 52-year-old man along with their two children aged eight and 12-years, were bound during the robbery.

The children then witnessed a prolonged vicious attack on their parents.

Police have been told the four men ransacked the store before fleeing out the back of the premises into a laneway with a quantity of jewellery and cash.

The injured pair was conveyed to the Royal Melbourne Hospital; the man sustained a fractured skull and underwent surgery on the night of the robbery and the woman sustained head and upper body injuries.

Both remained in hospital for some time for treatment to their injuries.

The children were not physically injured during the incident however were conveyed to the Royal Children’s Hospital for precaution.

Detectives have released images of the men they believe can assist with their enquiries and perceive them to be Sri Lankan in appearance, about 173cm tall and in their late 20s to early 30s.

The first man is described as skinny and clean shaven with short hair. He was wearing black jeans and a black top at the time of the attack.

The second man is described as skinny with a small goatee.

The third man is described as solid, with medium length dark coloured hair, a dark beard and blue shirt.

The fourth man is described as skinny and was wearing a baseball cap.

Police have also released an image of a car believed to be involved in the robbery.