PORTLAND -- As the probe into the disappearance of Kyron Horman entered its eighth week, investigators were focusing their energy on how his step-mother, Terri Moulton-Horman, spent a few key hours the morning he vanished.

There were gaps in what she had told investigators she did that day, including a key portion of time that she said she took her daughter, Kiara for a ride, according to reliable sources, including people who have spoken with investigators.

Investigators have been comparing where Terri said she was with what they have been able to establish about her movements that day.Terri told investigators that she drove Kiara around a series of rural roads for an hour, saying she was trying to calm her down because Kiara didn't feel well. Meanwhile, she told some of her friends that Kiara had an earache.

There were some things Terri did that day that were confirmed.

She went to the gym for about 45 minutes that morning and arrived home around 1 p.m. to post pictures from Kyron's science fair on her Facebook page.

Investigators were looking at surveillance video from stores she said she visited and roads she claimed to have traveled on, to check out her report of how she spent those hours.

Meanwhile, the sources said that some of Terri's friends have not only been the subject of searches, they have been interviewed by investigators and, in some cases, took polygraph tests.

Terri has not been charged with any crime though law enforcement officials have made it clear she is the focus of the investigation.

Complete coverage: Search for Kyron Horman

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