UPDATE: The test is complete. Special Operations personnel say the ugly sheen is just a form of algae and no hazard.
CHATTANOOGA (WDEF) – The Chattanooga Fire Department is investigating a murky sheen on the Tennessee River.
The came in as a spill near the Aquarium on the Riverfront.
But it was not an obvious spill of some sort.
Fire crews have put out river booms as a precaution to keep it from spreading.
They have gathered samples to have the water tested.