Published: Mar 03, 2011 10:14 PM EST
Updated: Mar 03, 2011 7:15 PM EST

DELRAY BEACH, Fla. (AP) - Police said Thursday they think they have identified two children whose bodies were stuffed into luggage and dumped in a South Florida canal.

Authorities believe the children - a girl between 6 and 10 and a boy between 10 and 12 - were siblings, but they have not released their names.

They said they have made no arrests, though they could be seen Thursday afternoon searching a nearby house.

A police spokeswoman said authorities believe the children were the victims of some sort of domestic situation, but she declined to elaborate.

It is still not known how long the bodies were in the canal, and autopsy reports haven't been released.

The girl's body was found in a duffel bag Wednesday morning. The boy's was discovered later in the day, folded into a suitcase about a half-mile away.

Divers from three agencies used sonar and a remote-controlled submarine to scour the canal for clues Thursday.

"They are trying to see if there is anything that is going to help us move further on this," Delray Beach Police spokeswoman Nicole Guerriero said.

The wide canal flows east to west through this oceanside town southeast of West Palm Beach, stretching between U.S. 441 and the Intracoastal Waterway and passing beneath Florida's Turnpike and Interstate 95.

It is bordered by modest homes, tiny wooden docks and small motor boats, and dotted on either side with the lush green of palms and other trees.

Debbie Duarte, who lives along the canal, said the neighborhood is usually very quiet. Before now, she said, the most surprising thing to turn up in the waterway was a bag of marijuana.

"For parents not to say their children are missing," she said, "either the parents are dead or the parents did it."