FORT LAUDERDALE, Fla. — A man who fled to China and his sister have been charged after an explosive device was left outside a gate at MacDill Air Force Base in Tampa this month. Alen Zheng, 20, and Ann Mary Zheng, 27, were charged Wednesday in separate federal indictments. The sister is in custody, while the brother has fled, according to a social media post by FBI director Kash Patel. Alen Zheng is charged with attempting to damage government property, unlawfully making a destructive device, and possessing an unregistered destructive device. The indictment specifically mentions the package found at MacDill. Ann Mary Zheng faces charges including witness tampering and being an accessory after the fact in Alen Zheng’s case. Online court records did not list an attorney for either person. A suspicious package was discovered outside MacDill on March 16, prompting an FBI investigation. The U.S. Central Command, responsible for military operations in the Middle East, is located on the base, which has been on heightened alert since the onset of recent regional conflicts. Earlier this week, another individual was arrested for making threatening phone calls to the base shortly after the discovery of the explosive device; however, there is no immediate connection between this individual and the Zheng siblings.