Detroit Public Schools officials say elevated lead or copper levels have been found in 19 schools amid ongoing testing.

The district began collecting water samples two weeks ago. District spokeswoman Michelle Zdrodowski said at the time that a number of factors, including the lead-tainted water crisis in nearby Flint, led to "proactive and precautionary" testing.

Officials said late Wednesday that 19 of the 62 buildings tested so far showed elevated lead or copper levels. The district didn't immediately release specifics about the levels that were found.

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The district says it is working to fix the problems, has shut down drinking fountains and is providing bottled water. Families were notified, and further testing is planned.

Lead is a neurotoxin that can damage child brain development, cause behavioral problems and sicken adults.