SALT LAKE CITY (AP) — Elizabeth Smart's little sister, the sole witness to the teen's apparent abduction, waited two hours to tell her parents about the kidnapping because she feared the kidnapper was still in the house, authorities said Wednesday.

Police Chief Rick Dinse said the girl, Mary Katherine, got out of bed soon after the abduction and headed toward her parents' bedroom. But she saw the man still in the house, so she went back to her room and waited for two hours.

He gave no detail on what the man was doing during the second sighting.

On Tuesday, police changed a key detail in the case. Their initial report, which they say was based on secondhand accounts, stated that Mary Katherine had been threatened by the kidnapper to keep quiet about the abduction.

They now say that Mary Katherine, who was in the same bed as Elizabeth, feigned sleep during the abduction and overheard the threat addressed to Elizabeth.

"She hasn't wavered one bit from her original statement that she gave investigators," Dinse said.

Dinse rejected any idea that his department was deliberately deceiving the media, though he acknowledged that information sometimes was withheld for strategic purposes.

"There is no conspiracy afoot here," Dinse said. "We are not telling you everything ... and we probably are not going to until we're further along."

Wednesday was the 15th day of the investigation into Elizabeth's abduction. She was reportedly taken from her bedroom at gunpoint in the early hours of June 5, police said.

Police still have no suspect in the case. They have received a total of 8,000 to 10,000 leads, of which 1,300 warranted follow up, Dinse said. Up to 900 of those leads have been cleared and about 400 remain to be looked at, he said.

Police who interviewed Mary Katherine four times now say the man did not speak to the younger child or apparently realize she saw him.

Working from Mary Katherine's description, police are looking for a white man, 30 to 40 years old, with dark hair and hair on his arms and back of his hands. He was wearing tan pants, dark shoes, lighter jacket and a Scottish-style golf hat. He held a small handgun.

"This investigation would be very, very difficult without Mary Katherine. She has provided us with a tremendous amount of information, and we're very appreciative of her," Dinse said. "I'm saying again, I believe we will resolve this case eventually, and Mary Katherine is a big part of doing that."

The community is offering a $250,000 reward for Elizabeth's safe return.

A Web site set up to find the teen is getting more than 2 million hits a day, said David Smart, Elizabeth's uncle.