Graffiti which is believed to be racist has been scrawled on homes in Wellingborough.
The letters PLM have been written on the walls of houses in Vivian Road and Newcomen Road.
John Casserly, head of environmental services at Wellingborough Council, said the graffiti would be painted over within a few days.
He said: “We are aware of the graffiti and have made contact with the property owners in Vivian Road, as before we can remove, or paint over such incidents, we have to have to obtain the property owners permission.
“We strive to remove any offensive graffiti within 24 hours but it is not always so straightforward.”
A Northamptonshire Police spokesman said: “Graffiti can be a form of anti-social behaviour, it can detrimentally affect the quality of life for people living in an area, is unsightly and can increase the fear of crime.
“Any form of graffiti is unacceptable but especially graffiti that may be racist, rude or offensive.”