MINNEAPOLIS — A KSTP-TV photojournalist was sore Sunday after a police officer knocked the camera off his shoulder without warning while he was filming the arrests of Occupy Minnesota protesters.

Twelve demonstrators were arrested about 11 p.m. Saturday for blocking traffic and being a public nuisance.

KSTP-TV news director Lindsay Radford said cameraman Chad Nelson was filming the arrests when an officer knocked his camera to the ground.

Radford said the camera was damaged and Nelson has some whiplash.

She said the station wants to meet with the police chief’s office because: “We don’t think this is an appropriate way for police and the media to interact.”

Police said the incident is being investigated. Chief Tim Dolan released a statement to KSTP-TV saying the Police Department won’t support unjustified use of force.