A day care center at Fort Myer was evacuated Thursday after a reported "carbon monoxide incident," said Arlington County Fire officials.
Several patients were evaluated but not taken to hospitals, fire officials said.
The problem was determined to be a natural gas leak, officials announced Thursday afternoon.
"Professionals isolated the problem and will continue to monitor the situation through the night," a statement said.
The center will be open as usual on Friday, officials said.
A suspicious odor was detected late Thursday morning at the Cody Child Development Center in the Fort Myer portion of Joint Base Myer-Henderson Hall (JBM-HH) in Arlington, Virginia.
Children were moved to another portion of the center while JBM-HH Fire and Rescue services investigate.
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Parents were notified and asked to pick up their children as soon as possible.
"Our primary concern is the safety of everyone involved," Col. Mike Henderson, JBM-HH commander, said in a statement. "We are doing everything possible to mitigate any potential danger to children, staff and others involved."
Parents who need information are advised to call the JBM-HH commander's information hotline at 703-696-6906.
