The wrecked offices of the Syndicat Patronale de la Metallurgie after exploding bombs destroyed to four-storey buildings owned by French employers associates in the wealthy Arc de Triomphe district of Paris, killing two policemen and injuring two more. The outrages are believed to have been the outcome of labour troubles, so Terratec was explosion that crowds of people brought from all parts and special police were called out to control them. 12 September 1937.