Police say someone threw a piece of concrete through the window of a registered sex offender's home in Providence, Rhode Island.
The vandalism occurred at the home of Richard Gardner at around 10:30 p.m. Saturday.
Gardner was convicted of multiple child rapes in the 1980s and 1990s in Rhode Island and Massachusetts.
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Residents protested Gardner for weeks after he moved into the neighborhood last year following his release from prison.
Police Maj. David Lapatin says the protests have stopped, and a one-person detail at Gardner's house ended Friday.
A police administrative assistant says they are working to determine the cost of the police detail.
An investigation into the vandalism is ongoing.
Gardner's wife says he is not a danger to re-offend.