Officials say the crews responding to Sunday’s chemical spill at the DuPont Louisville plant have ended their work, but clean up and an investigation is ongoing.

The spill leaked 400,000 gallons of hydrochloric acid that forced a “Shelter-in-Place” warning to those living within a one-mile radius of the plant. Officials say the leak was due to an equipment malfunction.

According to a release sent out by the city:

The tank where the initial leak occurred has now been emptied.  Plant personnel will continue with clean-up, remediation, and investigation efforts.  Local Emergency Management Agency/MetroSafe responders and environmental agencies worked closely with DuPont personnel throughout the week to ensure the safety of employees, the community, and the environment.”

No injuries or exposure to the dangerous chemical were reported.