On Wednesday evening, a potassium cyanide leak in a Czech laboratory injured a member of staff, a spokesman for the fire department, Martin Kavka, reported.
"A leakage occurred during the work with the poisonous substance which had to have been destroyed. A chemist got an arm injury and was taken to hospital," he said.
A special ventilation system was automatically activated in the laboratory, thus there was no imminent threat to the environment, according to Kavka.
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The area around the laboratory was cordoned off by the police during the operation, which had been concluded by Thursday morning.
In March, Prague witnessed a blast at a Unipetrol plant 30 km (19 miles) north of the city that killed six people.
