The 41-year-old man arrived at the Socialist Party HQ, in the 7th arrondissement of Paris, at 5am yesterday and attempted to erect a banner.
On the banner the man reportedly wrote his name, contact details, and information about an ongoing situation with his local town hall.
The guardsmen at the premises quickly spotted the man and raised the alarm.
Police later tracked down the 41-year-old through the details he had written on his banner, and arrested him in his hotel room in the town of Malakoff, just south of Paris, where they also found another fire extinguisher full of ethanol.
A source told daily newspaper Le Parisien: “The man seemed to have a dispute with his local council. He thought they were treating him badly and he wanted to make it known.”