A married couple and their two teenage daughters have been named as the four people whose bodies were found at a house.
Jatindra Lad, 49, his wife, Duksha Lad, 44, and their daughters, Trisha 19, and Nisha, 17, were found dead at their detached home in Clayton, Bradford, last night.
West Yorkshire Police have launched a murder investigation but said they are not looking for anybody else in relation to the deaths.
The husband and wife both worked for Bradford council.
Councillor David Green, leader of the local authority, said: “Local people are shocked and saddened by the news of this terrible event and our sympathy goes out to the wider family, friends and neighbours of this family.
“The husband and wife of the family... both worked for Bradford Council and councillors and employees are very upset after hearing the dreadful news of their deaths.
“Obviously, it would not be appropriate to comment further at this stage as the investigation into how it happened is continuing, but we would urge anyone who may have any information about this tragedy to contact the police immediately.”