Two registered sex offenders were fatally shot in their homes Sunday morning, prompting the state to take down the Maine Sex Offender Registry Web site.

State police said the site, which contains the photos, names and addresses of more than 2,200 registered sex offenders, was taken off-line as a precaution.

Investigators said a 19-year-old Canadian man described as "a person of interest" in the case shot himself in a Boston bus station after he was cornered by police later Sunday.

Stephen A. Marshall was in critical condition at Boston Medical Center, a spokesman said.

The pickup truck Marshall was driving was spotted leaving one of the victim's homes after the shooting, Maine state police said. They alerted authorities in Boston after discovering the vehicle abandoned and bullets linked to Marshall in the bathroom of a bus station, said Stephen McCausland, spokesman for the Maine Department of Public Safety.

The shooting victims were identified as Joseph L. Gray, 57, of Milo, and William Elliott, 24, of Corinth.