A fire has been brought under control outside the Quinn packaging plant at Ballyconnell in Co. Cavan.
Gardai say a single-decker bus was set on fire at around 5:30am this morning and no-one was injured.
The bus was parked across the entrance to three businesses, which are believed to be owned by the Quinn Group.
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The scene of the incident is sealed off pending a garda technical investigation.
It is the latest in a series of attacks on the former Quinn Group, now known as 'Aventas'.
Back in December a stolen oil truck was driven into it's headquarter buildings in Derrylin and set alight.