A man and a woman were badly injured when they were attacked in their own Coventry home by masked men brandishing a machete.
The attack happened at 9.30am on Wednesday at Hill Road, Keresley End, Coventry.
A 42-year-old man and an 18-year-old woman were injured.
Three raiders made off in a silver car and were last seen driving along Somers Road, Keresley End in the direction of Shaftesbury Avenue.
Warwickshire police are appealing for any witnesses who saw anything in Hill Road at the time of the incident, or who saw the car or who has any information to come forward.
Police are also urging people to report if they have seen any knives or other disguarded weapons or items of clothing in the area.
They are investigating possible links with another similar attack in the same area on February 13.
Anybody with information is asked to contact the Major Investigation Unit at Rugby Police Station on 01788 853951 or they can contact Crimestoppers on 0800 555111 where the information can be given anonymously.
