An environmental protection group in France is suing authorities in Paris for neglecting to warn the public about the risk of toxic lead particles entering the air after the fire at Notre Dame. The lawsuit launched by the Robin des Bois (Robin Hood) group alleges that officials in Paris “deliberately” put people in danger by not doing enough to protect the public from pollution caused by the fire in April, which destroyed the cathedral’s lead-covered spire and much of the medieval building’s roof. 

The environmental campaigners filed the suit after exceptionally high levels of lead were found in the air after the fire. Hundreds of tons of the metal melted during the blaze, causing toxic particles to enter the air, which settled across the local neighborhood.

While officials in Paris insist there is no danger to residents, last week they ordered a deep cleaning of schools near the cathedral. Health authorities recommended blood tests for children and pregnant women who live nearby. Meanwhile, two schools running summer programs were shuttered as a precaution.

Construction workers who were working on site to consolidate the cathedral were also sent home after the prefect for Paris, Michel Cadot, admitted that there had been inadequate measures taken to prevent contamination. Extra safety measures are now being introduced, according to the French paper Le Figaro.

Robin des Bois’s lawsuit has been filed against the “relevant authorities, including the diocese, [which] neglected to assist residents, visitors, and workers, allowing them to be exposed to the toxic fallout,” the Guardian reports.

Soon after the fire, the Paris police recommended locals wipe down surfaces, and that children and pregnant women wash their hands more often, but it was a whole month before officials began testing the surrounding area for lead. The activist group says that French officials should have immediately taken measures to mitigate the threat to public health.

In serious cases, lead poisoning can cause brain and nerve damage, and children are particularly vulnerable. The suit accuses health agencies, government officials, and the City of Paris of “deliberately putting people in danger” by delaying action to reduce possible contamination.

The CGT firefighter’s union is also worried that insufficient measures were taken to decontaminate equipment after hundreds of firefighters tackled the blaze. A representative for the organization told France Info that the group has written to authorities to check whether there has been sufficient follow-up medical care for the firefighters.