A man has been arrested on suspicion of murder after the bodies of a woman and two children were discovered in a flat.
The 30-year-old suspect has been taken to hospital after falling ill and police said a post mortem will be carried out to establish the cause of death of the deceased.
Merseyside police were called to a ground-floor flat in Falkner Street, Toxteth, at around 7.30pm on Tuesday.
A spokesman said the investigation was in its early stages, but it is believed to be “domestic related”.
They added police were not looking for anyone else at this stage.
Earlier in the evening people in Falkner Street were evacuated from their homes over concerns about a fuel leak.
Police closed the street and urged people in neighbouring roads to remain indoors and keep windows closed.
Anyone with information is asked to call police on 0151 777 4065 or Crimestoppers anonymously on 0800 555 111.