SALT LAKE CITY (AP) — At least 50 people reported feeling sick after sulfur dioxide spilled out of a rail car in Salt Lake City.

The Salt Lake City Fired Department said the leak occurred Wednesday morning at a chemical manufacturing plant called Thatcher Chemicals. Fire officials estimate that 300 to 400 gallons of sulfur dioxide leaked.

At least two people were taken to the hospital for treatment. Their conditions were unknown.

Most people reported feeling a burn in their throats or having trouble breathing.

Fire officials say the spill is contained.

The Utah Division of Water Quality sent crews to test for possible contamination in a canal near the location in the western part of Salt Lake City.