UPDATE: Authorities say a grandfather shot and killed his daughter and her six children today before turning the gun on himself in Bell, Fla.

Read more from FoxNews.com:

The children ranged in age from three months to 10 years old, Gilchrist County Sheriff Robert D. Schultz III told reporters at an evening press conference.

Schultz identified the suspect as Don C. Spirit, 51, a white male. The sheriff said Spirit had placed a 911 call around 4:30 p.m. in which he "made reference to harming people and himself."

Schultz declined to speculate on a motive, citing the ongoing investigation, but he said Spirit had a criminal history, and that police had been called previously to his house.

"We're asking for prayers for this community and the victims involved," Schultz said.

In 2001, Spirit pleaded guilty to a charge of possession of a firearm by a convicted felon after he fatally shot his 8-year-old son in the head in a hunting accident, the Orlando Sentinel reported. Spirit, who also was convicted in 1998 for felony possession of marijuana, was sentenced to three years in prison for the shooting, the Sentinel added.

Bell is a town of 350 people about 30 miles west of Gainesville.

The Associated Press contributed to this report.

Read the original story below:

Shepard Smith tonight reported that six children have been murdered in the last few hours as part of a murder-suicide.

Eight people are believed to be dead.

A news conference will be held at 8p ET.

Stay with Fox News for the latest.