A special electors' meeting at the City of Swan descended into chaos on Monday night when Mayor David Lucas was allegedly attacked and struck in the head with a microphone.

The meeting at the Midland Town Hall was called to discuss redevelopment plans for Midland Oval, a topic of heated debate and protests in recent weeks.

It is understood shortly after the meeting — which was attended by about 150 people — a man approached Mr Lucas, allegedly lashing out with the microphone, before he was tackled to the ground.

The man sustained minor injuries, while Mr Lucas suffered a cut to his head.

St John Ambulance officers treated both men at the scene.

The motive for the alleged attack is not yet known.

The alleged attacker was tackled to the ground by others at the meeting, sustaining minor injuries. ( Supplied: Midland Echo )

Police have confirmed a 67-year-old man was arrested, and charged with assaulting a person performing a public function, and unlawful damage.

He is due to face court next on July 10.

Former cop used to violence

Mr Lucas declined to comment when contacted by the ABC, but his son told ABC Radio Perth his father was in good spirits.

Cameron Lucas said his father had seen plenty of violence previously, having served more than 30 years as a police officer.

"Over those years he's obviously had to put up with a fair bit of brutality, but nothing as a public member of the City of Swan," he said.

"Knowing my dad he will just brush it aside and say it's just one incident in over 27 years (as a councillor).

"But waking up to the news is pretty disappointing as my father just goes to work and does his business for the community.

"Having someone want to stand up in front of you and want to smack you over the head with a microphone is pretty poor."

'Disgraceful' attack unwarranted, says councillor

Councillor Mark Elliott said the man had indicated he had more to say, and became aggressive when the meeting ended before he was able to finish saying his piece.

Cr Elliot pulled the alleged attacker off the Mayor, who he said was understandably shaken.

"It's entirely unwarranted what occurred, and unjustified and disgraceful that it's happened in what's meant to be a civic public discussion," Mr Elliott said.

"People's passions in the room were quite high, it's a fairly emotive issue and one which has regrettably attracted an undercurrent in which people think that verbal abuse and defamation are acceptable.

"I think when you have a civil discourse that encourages that verbal behaviour, that when it escalates it should give us room to pause and think about whether the tone of debate about certain issues is hitting the mark.

"And I don't think it is."

Facebook page pulled down amid threats

An administrator for the Save Midland Oval Facebook page posted late on Monday night to say she had received threats following the meeting.

"I have had to unpublish the Save Midland Oval page as I was receiving copious amounts of threats and angry messages directed at me on the page and on my personal account," she wrote.

"Until I have spoken to police, the page will be unpublished.

"I hope you can understand that as a 23-year-old woman I don't have the capacity to deal with people making personal threats against me and feel a wee bit unsafe at the moment."