FLOWER MOUND, TX -- Police on Friday afternoon arrested a 46-year-old Flower Mound man who is accused of sexually assaulting a young boy this week.

David Wayne Wiersema, formerly a longtime volunteer for the Boy Scouts, remained in the Flower Mound Jail late Friday awaiting arraignment on suspicion of aggravated sexual assault, officials said.

The boy, who is younger than 14, is not being identified, police spokesman Lt. Wendell Mitchell said.

The child's mother had to leave home quickly Monday night and asked Wiersema to watch her children, Mitchell said. On Tuesday evening the child told his mother that he had been assaulted, and his mother called police, Mitchell said.

Aggravated sexual assault of a child is a first-degree felony, punishable by up to 99 years in prison and a $10,000 fine.

Longhorn Council Scout Executive Dan Clifton said Friday that Wiersema e-mailed him that day resigning his position with the Boy Scouts. Clifton said he did not know details of the case.

Clifton said Wiersema had been inactive for more than a year but had been an adviser for the Tindeuchen Chapter 34, which meets at a Methodist church in Flower Mound.

"He has been involved for a long time with the Scouts in Flower Mound," Clifton said.