A Buxton woman who was tied up and assaulted when she walked in on a robbery in progress in her Callahan Road home is offering a $500 reward for information that leads to the arrest and conviction of those responsible.

Deborah Nielson, who goes by the nickname “Nonny,” arrived at her house shortly after 9 p.m. last Friday and found two men and a woman inside, robbing her house, Buxton police said.

She was then tied up and assaulted by the trio, who took some cash from the house and left.

Nielson’s face was bruised and cut when she was assaulted.

The assailants are described only as in their late teens or early 20s.

Nielson, 60, is a volunteer in local schools.