Police have released CCTV images of two men vandalising Minister Gerry Brownlee's office in Christchurch.
The incident happened in the early hours of Monday morning, when the two men broke a window and poured fuel inside.
"The two men are believed to have travelled to and from the scene on two motorcycles," Detective Inspector Greg Murton said.
"They appear to have approached the property heading southwest along Greers Rd and have left the scene in the opposite direction heading northeast."
A scene examination took place yesterday.
Police are urging the public to report any suspicious behaviour in the area around 3:15am or any information that could identify the men.
Anyone with information should contact police on (03) 363 7400 or anonymously through Crimestoppers on 0800 555 111.