One man was killed and another seriously injured after a double shooting.
The pair were attacked inside a house in Leeds at around 5.30pm tonight.
They were both taken to hospital but one of the victims, 21, was pronounced dead a short time later.
A 31-year-old man is being treated for serious wounds to his lower body.
The incident took place on Blue Hill Crescent in the Wortley area of west Leeds.
Detective Superintendent Simon Beldon, of West Yorkshire Police, said: "At this time our investigations are at a very early stage and forensic examinations are taking place at the scene.
"We believe that the shots were fired inside the property, however inquiries are ongoing to establish the full circumstances.
"The nature of this incident suggests it was a targeted and isolated attack and a team of detectives are currently working hard to quickly identify those responsible for this serious crime.
"Neighbourhood policing team officers are also patrolling the local area, speaking to residents and responding to any concerns they may have."
Anyone with information is asked to contact police on the non emergency number 101 or Crimestoppers anonymously on 0800 555 111.