“The vast majority are able to engage peacefully without a problem. Clearly, a small minority won’t, and they need to be condemned.”

A spokeswoman from Khalil’s office said staff had arrived at work about 8.45am on Monday to find the office had been vandalised.

“Alongside the vandalism shown in photos, a hole had been drilled into the back door and a red [or] pink substance pumped into the office,” she said.

“Staff reported an overwhelming stench on opening the door, like an abattoir.”

She said the office was closed to the public as police investigated, and staff would not be on site.

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Coalition senator James Paterson said the continued targeting of Khalil’s office was unacceptable.

“The perpetrators of this intimidating and dangerous behaviour must feel the full force of the law,” he said.

Greens leader Adam Bandt said the Greens condemned the vandalism.

“Protests must always be peaceful and non-violent. Everyone should feel safe at work, and we wish Peter Khalil and his team well after this vandalism overnight,” he said.

Germany banned the inverted red triangle in July because of its use by Hamas and its supporters to mark enemy targets in videos and graffiti.

Since the terrorist group’s October 7 attacks on Israel last year, the triangle has morphed into an online symbol shared by the terrorist group’s sympathisers as well as pro-Palestinian activists, including some unaware of its origins. It has been displayed in pro-Palestine protests in Melbourne, including in Khalil’s seat.

Monday’s vandalism is the latest in a series of attacks on MPs’ offices this year. In July, two teenagers aged 17 and 18 were charged with burglary and criminal damage after Labor MP Josh Burns’ Melbourne office was targeted.

Prime Minister Anthony Albanese said at the time it was a troubling escalation of radical pro-Palestinian activism in Australia.