CHICAGO, April 3 (Xinhua) -- Investigation has been launched after a shooting caused a temporary lockdown of the Fort Knox army base in Kentucky on Wednesday afternoon, according to local news reports.
There were no immediate reports of casualties, a fort spokesman told WDRB-TV. The lockdown was lifted about 7 p.m., but traffic in and out of the fort was slow because of increased security.
A civilian was flown by helicopter to a hospital, but there was no immediate word on the victim's condition, a military official told NBC News.
The shooting happened near the Human Resources Command, which has 3,800 employees.
Fort Knox, about 60 kilometers from Louisville, Kentucky, is home to more than 40,000 soldiers, family members and civilian employees.
Less than two weeks ago, a U.S. Marine shot two colleagues to death at a Virginia base before killing himself.
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