An Indian-origin couple and their two children were found dead in their home in the US state of New Jersey and police are investigating the matter as a homicide.

Tej Pratap Singh, 43, and Sonal Parihar, 42, were found dead alongside their 10-year-old son and 6-year-old in their Plainsboro home sometime after 4:30 pm (local time) on Wednesday, the Plainsboro Police Department said.

Middlesex county prosecutor Yolanda Ciccone and chief Eamon Blanchard of the Plainsboro Police Department announced on Thursday that a homicide is currently under investigation.

"On the evening of October 4, authorities received a 911 call requesting a welfare check at a residence in Plainsboro. Upon their arrival Plainsboro Police Department discovered four deceased victims in the house," they said in a joint statement.

"This tragedy remains under investigation and autopsies are being performed today," they said, adding an initial investigation determined that there is no threat to the public.

Anyone with information or surveillance footage of the area is asked to call the Plainsboro Police Department.

A joint message from mayor Peter Cantu and chief Eamon Blanchard, director of public safety, said that the Plainsboro community experienced a heartbreaking loss of life.