Passive resistance measures where ably demonstrated in the streets of Paris today by French authorities . The police , firemen and sanitary attachments took part in the impressive display of the up - to - date measures to be taken in event of an air attack on the capital . The demonstration took place over a wide area on the Left Bank of the city . Photo shows ambulance worker and police removing ' victims ' of a gas bomb from the rue Antoine Dubois in Paris . 14 May 1935