Two students who were shot at the front door of their home in Luton were the victims of mistaken identity, police believe.
The men, both 26, were shot on Tuesday night when they answered a knock at the door of their home in Ashton Road.
Both men are still being treated for their injuries, which are not life-threatening, at the Luton and Dunstable General Hospital.
Police want to trace three men who they say may have targeted the wrong house.
Det Ch Insp Steve Collin said: "Police have completed extensive background checks and we believe that the two young men injured during this incident are innocent of any wrongdoing.
"Both had only been in Luton for a short time and it is possible the offenders either went to the wrong address or were looking for someone else when they went to the house."
Officers think the gunmen were two black men and a third man, who had a lighter complexion, seen running along Tavistock Crescent shortly after the shooting.
"It is of vital importance that members of the public continue to help the police with this investigation," Mr Collin added.
"We need to trace these men and stop them from continuing to use firearms in our town."