As police searched for the killers of a couple whose young sons found them shot dead in their home, family friends and relatives said they were mystified by the slayings.

Nassau County police identified the victims as Jaspal Singh, 46, and Geeta Singh, 38.

Their sons, 12 and 13, came home from school expecting to be greeted by their mother, but nobody answered the door, police said. They said the boys used a spare key to get in and found their parents' bodies.

The boys ran to alert a neighbor, said Michael Moore, 13, who lives across the street.

"They were saying, 'How could this happen to us?"' he said.

Neighbors said the family, originally from India's Punjab state, had moved into the home less than a year ago and previously lived in Queens. A family friend, Raj Maini, said the parents had emigrated 18 years ago.

"It's just crazy. I can't believe it. He was such a good man," Maini said, referring to Jaspal Singh.

Police said the children were staying with relatives. Local schools planned to offer grief counseling to students Wednesday.