US government worker, target of exit ban, kept from leaving China for months

An American citizen who works for the US government has been blocked from leaving China for months, possibly on national security grounds, after travelling there recently, the South China Morning Post has learned.
A source familiar with the matter said that a naturalised US citizen, originally from China, was detained by authorities upon landing in Chengdu, Sichuan Province, in April.
The exact reason for the exit ban, as these restrictions are typically known, could not be confirmed, though the…