Federal, state and local authorities are continuing to investigate whether a Texas meat-packing plant illegally dumped pig blood into a creek that flows into the Trinity River. The Trinity River is the main contributor of fresh water to Galveston Bay according to the Living with the Trinity project

CBSDFW.com reports that investigators executed search warrants at the Dallas-based Columbia Packing Company last week.

The Texas Environmental Crimes Task Force has been looking into the plant for months, when a man taking scenic photos of the Trinity River saw what appeared to be blood. Dallas County officials have been working with state and federal investigators since the tip came in.

According to Health and Human Services Chief Zach Thompson, EPA, Texas Commission on Environmental Quality and Texas Parks and Wildlife investigators executed a search warrant on Jan. 19 and found a pipe not connected to a waste water system.

Columbia Packing Company is a 99-year old family-owned pork processor with 100 employees. The company has ceased operations pending further investigation and approval from governmental agencies.

In a statement, Columbia refutes the allegations.

“Columbia has never and would never intentionally engage in the activities recently alleged in the media.  It was surprised by the allegations raised last week and was previously unaware of any such concerns,” Columbia said in a statement.

The company is cooperating with government officials.