A man has been arrested in connection with an explosion which caused minor damage to a Conservative Party office in Lincolnshire early on Monday.
Grantham and Stamford MP Nick Boles issued a statement condemning the "act of violence" after the blast at the Conservative Hall in Bourne.
A spokesman for Lincolnshire Police said a 24-year-old local man was helping with inquiries into the incident, which is not thought to be linked to any wider issues or recent events in the county.
Boles, who serves as a planning minister, said: "Obviously I deplore this act of violence.
"The incident is being investigated by the police and I know that everyone will do whatever they can to support the investigation. In the meantime, we should all carry on doing our jobs as normal."
Police were called at around 1.24am to reports of an explosion at the Grantham and Stamford Conservative Association office in Burghley Street, where Boles holds constituency surgeries.
A police spokesman said: "Officers attended the scene and minor damage had been caused to the building. No one had been hurt.
"Initial inquiries were carried out and a 24-year-old local man was arrested in connection with the incident."
Anyone who saw any suspicious activity in the area, or anyone with any other information about the incident, is asked to call Detective Inspector Pete Grayson on 101 number or to contact the Crimestoppers service on 0800 555111.