Officers attended a property in Winsover Road, Spalding, this morning at 5.32am and found the bodies of a man and a woman. Both were in their 30s.
A 29-year old man and a 46-year-old man were also found at the property and have been arrested and taken into police custody on suspicion of murder.
Investigating officers are now working to establish what has happened.
Some traffic restrictions are in place on Winsover Road and a scene guard is in place at the property.
If anyone has information which may assist this investigation, please make contact through one of the following ways.
• By calling 101 quoting the reference 59 of 25 June 2020
• By emailing email@example.com – please remember to put the reference 25 June 2020 in the subject box
• You can also contact us through the independent charity Crimestoppers, anonymously, on 0800 555 111 or online at crimestoppers-uk.org