One of three men who were shot to death at a home in a gated Los Angeles community likely allowed the shooter inside, authorities said Tuesday.

The victims were targeted in the shooting Monday, Capt. Billy Hayes said at a press conference. He did not release suspect descriptions. Nobody had been arrested in connection with the killings, officials said.

Hayes said detectives believe they know what motivated the crime but withheld the information because the investigation is at "a critical juncture."

A woman in an upstairs bedroom of the large, two-story home in the affluent Porter Ranch neighborhood heard a gunshot and called 911.

The woman is described only as a resident of the home with some type of relationship with the man who rented it, Gary Davidson, 39, who was killed. The other victims are Benny Lopez, 46, of Anaheim, and Jesus Perez, 34, of Perris.

Firefighters responding to a 911 call found the victims and called police to the residence in a housing development in the northwestern San Fernando Valley.

Guests and residents must drive past a guarded gate to enter the development, where homes list for more than $1 million. Detectives gathered surveillance video from the gate, and "we do have an idea of who's been in and out" of the community, Hayes said.

U.S. Rep. Brad Sherman, who lives in Porter Ranch, told Los Angeles news station KTTV that the killings in a small community "shakes you up a bit." He said he still feels safe.

___

Associated Press writer John Antczak in Los Angeles contributed to this report.