The Fort Worth Independent School District is investigating possible TAKS test irregularities at an elementary school.
The Texas Education Agency identified the school as Diamond Hill Elementary School on the city's north side.
"We take very seriously our responsibilities regarding testing security protocols," Superintendent Melody Johnson said in statement. "We will not tolerate any action, by any individual, that jeopardizes the credibility of our testing results."
The district placed two people at the school on administrative leave while it investigates, the Fort Worth Star-Telegram reported.
Johnson told the newspaper the irregularities involve the April retest.
Some students must pass the Texas Assessment of Knowledge and Skills tests to move on to the next grade. Test results are also used as part of the formula to determine a school academic rating.
Diamond Hill Elementary earned the top rating last year, according to the Star-Telegram.
The TEA said it is waiting for the Fort Worth ISD to complete its investigation before commenting.