LOS ANGELES, Sept. 3 — Police have no suspects, no motive and no murder weapon in the killings of actress Sharon Tate and four other persons at her estate.

And inspector Robert A. Houghton, chief of detectives, conceded during a news conference Tuesday the longer the investigation continues the less chance police have of solving the grisly crime.

“We have no idea where the killers are located at present,” Houghton said. Polive have questioned more than 300 persons in the United States and foreign countries, he said.

There were few new details released about the investigation. Houghton reiterated none of the bodies were sexually mutilated and said Miss Tate’s unborn child was not stabbed. She was eight months pregnant.

He said the murder weapons, apparently taken by the killers when they fled, were “a cutting weapon and a firearm.” Narcotics were found “in more than one place” on the estate but not in quantities to make them commercially valuable.

In addition to Miss Tate, the victims were mens’ hair stylist Jay Sebring, coffee heiress Abigail Folger, Polish writer Voityok Frokowsky, and Steven Parent, a friend of the estate’s caretaker.

Houghton, in reviewing police attempts to reconstruct the crime, said, “there are several possibilities, from the physical evidence, in sequence and in the method of doing it.

“Would it be possible for one man? Possible. Probable? I personally doubt it. Although I must tell you in all fairness we do not have conclusive evidence that one man could not have done it.”

Houghton was asked if the killer or killers might strike again.

“Personally, I presume not,” he answered. “Professionally, I couldn’t rule it out.”