ARLINGTON -- The Arlington Independent School District is firing back against a lawsuit from teachers, parents, and the NAACP who say Nichols Junior High School is making people sick.

The school district now says the National Institute for Occupational Safety and Health (NIOSH) found no connection between reported illnesses and the school's building.

Nearly a dozen teachers have told WFAA since last fall that they feel dizzy and nauseous at school. At least three teachers quit because of it.

Wednesday night the district told WFAA they believe the teachers are experiencing "heightened awareness," which NIOSH defines as "a phenomena where people begin noticing symptoms after hearing others talking about them."

A statement released late Wednesday by the district's attorney said the claims of a mystery illness at the school are "led by an individual whose opinion was rejected by at least one court and who has previously been accused of fraud." The statement also notes that, of the 500 complaints made, 380 came from 20 individuals and more than 100 came from one person.

The NAACP released a statement Thursday, saying the district is trying to "obfuscate the issue of persistent and uncompromising complaints of nausea, vomiting, headaches, and loss of consciousness by occupants of the Nichols Junior High School facility."

The organization says it's confident that if allowed access to the school, its experts "could identify the source of the issue."

Read the full statement from AISD's attorney, Dennis Eichelbaum, below or here.

Dennis Eichelbaum Statement on Nichols health claims by wfaachannel8 on Scribd