ITV News has filmed an altercation outside the home of Liberal Democrat MP Mike Hancock, earlier today.
In a statement, a Hampshire police spokesman said: "A reporter received an injury to his nose during the incident.
"Police officers attended and are conducting an investigation into the circumstances surrounding the incident.
"A 37-year-old man has been arrested on suspicion of assault, and is being taken into custody where he will be interviewed by officers today."
Mr Hancock was suspended from the party yesterday following a report on alleged sexual impropriety.
More top news
The government is treating the fight against obesity as a priority, as a new report cautions that one in five cancer deaths is caused by it.
Police have launched an urgent appeal after a prisoner convicted for a violent robbery escaped from HMP Dovegate in Staffordshire.
A brewery in the US stopped beer production and started canning emergency drinking water for flood victims in Texas and Oklahoma.