UK police said they were probing vandalism incidents after a pro-Palestinian group appeared to claim attacks on properties belonging to executives and employees at defence industry firms.
The group, called "The List", claimed on a website to have carried out three attacks in recent weeks, including one on the home of someone they said was a "key engineer" at defence contractor Leonardo.
"We are aware of an incident which targeted the property of a Leonardo employee last weekend," a company spokesperson said in a statement sent to AFP on Monday.
"We are also assisting Counter Terrorism Police with their ongoing investigation into this incident," they added.
Police Scotland confirmed officers were called on 11 October to a "report of vandalism to a property and cars" in Dunfermline, north of Edinburgh, where Leonardo has a site.
A video on the group's website appears to show someone tagging vehicles and a building wall with red paint.
The Sunday Times reported that The List had targeted three locations, including in Hampshire in southern England, where they reportedly slashed the tyres of a car belonging to an executive at Ultra Intelligence & Communications.
The List claimed on its website that it targeted Ultra's chief operating officer, whom it accused of working with Israeli arms company Elbit.
"We were called on Saturday, October 10, to a report of a criminal damage incident in Fleet," Hampshire police said in a statement quoted by the Times.
"It was reported that red paint had been thrown across the front of the house and two car tyres had been damaged," the police force added.
The group also said it targeted the home of Keysight's director of technology manufacturing.
The Palestine Action group was proscribed as a "terrorist" organisation by the UK government last year after a series of attacks targeting defence companies, including Elbit and Leonardo.
On its website, The List said it "escalated our actions against the home addresses of some of the most highly complicit companies in the ongoing genocide of our brothers and sisters in Palestine."
"Our list of complicit actors remains long, compiled through leaks, hacking and whistleblowers. If you work with Elbit, expect us," the group added.