There have been more dynamite attacks in the South of France, with explosions in Montpellier and Carcassone last week.
Winegrowers, and the breakaway protest group CRAV, are thought to be behind the explosions, which were caused by sticks of dynamite being thrown at state buildings.
A car was also set on fire. No one was hurt but material damage was reported.
The latest incidents in a run of wine-industry related violence have been condemned by winegrowers' associations.
CRAV has allegedly also carried out acts of vandalism at supermarket chains in the past week.
Official growers groups have called for a new demonstration on 20 April in Narbonne.
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