Two teenage boys passed a shotgun between them to shoot three young women in the head at close range on a gated estate, police said.

The teens, one of whom was the boyfriend of one of the victims, told police the slayings took place after they argued with the victims but they could not remember what the argument was about, Lt. Van B. Anthony said Monday.The Los Angeles County district attorney's office will seek to have David Adkins, 16, and Burt Vinny Hebrock, 17, both of South Pasadena, tried as adults, Anthony said. Prosecutors on Monday filed three counts of murder with special circumstances against each teen.

The bodies of Katherine Macaulay, 18, Heather Goodwin, 18, of San Marino, and Danae Palermo, 17, of Alhambra, were discovered by police early Friday in a pool house on the Macaulay family's estate in an exclusive neighborhood.