A Florida man was arrested Monday for threatening to kill Gov. Terry Branstad and Lt. Gov. Kim Reynolds, as well as other Iowa state officials.

The Tampa Bay Times reported the arrest, and the governor's office confirmed the threats to The Des Moines Register Tuesday afternoon.

Florida law enforcement agencies have not returned requests for comment.

"We had received an email over the weekend from this individual into our generic contact form on our website," said Ben Hammes, the governor's spokesman. "We got the email on Monday, and we were in contact with the Florida law enforcement folks."

The Times reported that Richard Gillow, 59, sent the emails and posted to his Facebook page threats about killing state officials who removed his grandchildren from his daughter's custody.

In addition to Branstad and Reynolds, the threats included Attorney General Tom Miller, Guardian Ad Litem Kim Ayotte and an employee of the state's Department of Human Services.

Hammes said the email was found by a staffer who alerted authorities.

Gillow was arrested by the Pasco County Sheriff's Office Monday and is being held on a $10,000 bond.

"It’s certainly not the first time this has happened," Hammes said. "But we take all threats seriously and we let the professionals at the Iowa Department of Public Safety handle it."