Detectives are looking for two hooded men who called at a house where a woman was shot dead yesterday.
Police have launched a murder investigation following the shooting at a home in Hinckley.
Officers were called at 10.45pm and found a woman inside the house with gunshot wounds.
She was confirmed dead at the scene.
Formal identification of the body is yet to take place and the post mortem examination will happen this evening.
Detectives believe that, before the shooting, two men had called at the house, where the victim and a third man were inside.
They believe that the two men who called at the house were involved in the incident and are keen to trace them.
Officers say the two men, who both had their hoods up, left the scene in a dark coloured car that was parked in the street.
A 27-year-old man has been arrested in connection with the incident and is currently in police custody.
Detective superintendent Tom Davies, from the East Midlands Major Crime Team said: "This is an incredibly tragic incident and we are determined to find those responsible.
"Although we are only in the very early stages of the investigation we believe that the two men who stopped at the house prior to the incident were involved.
"Officers are looking into the possibility that those two men may have travelled from outside of the Leicestershire area.
"We are currently doing all we can to trace these two men and have a dedicated team of officers working on this investigation, talking to witnesses, carrying out forensic enquiries and looking at CCTV in the area. Local officers have also been out throughout the night talking to local residents and offering them reassurance.
"Incidents like this are unheard of in Leicestershire, and gun crime is not something we come across often.
"This makes us determined to do all we can to locate the perpetrators and bring them to justice.
An area around the house remains cordoned off while police carry out their inquiries and officers are urging anyone with information about the incident to come forward. No information about the weapon has been released.
Det Supt Davies added: "If you know anything about this incident, anything about those responsible or anything that could help us locate them, please don't hesitate to get in touch. Perhaps you saw two men in the area acting suspiciously? Maybe you heard the gun shots and saw the men drive away? If so get in touch. It's important that we have all the information available to ensure that we resolve this as quickly as possible."
Anyone with any information is asked to contact police on 101. Alternatively, contact Crimestoppers, which is free and anonymous, on 0800 555 111.
