Little is known about the exact nature of Ms Cheng's alleged offences and it's not clear when a verdict will be handed down. Speaking to reporters outside of the courtroom on Thursday, Australia's ambassador to China Graham Fletcher said he and other Australian officials had been denied entry into the hearing. Chinese courts often bar outsiders from trials deemed politically sensitive.
"This is deeply concerning, unsatisfactory and regrettable. We can have no confidence in the validity of the process which is conducted in secret," he said, adding that Australia would continue to "advocate strongly for Ms Cheng Lei's rights and interests".