Danhao Wang, an assistant research scientist in the school's College of Engineering, died on March 20 after falling to his death on campus. 

Police said they are investigating his death as a 'possible act of self-harm', with the Chinese Ministry of Foreign Affairs claiming he took his own life after 'hostile questioning'. 

A statement, which did not name Wang, said that the postdoctoral scholar died by suicide 'after being subjected to hostile questioning by US law enforcement'.

It added: '[This] calls into question once again the impact and legitimacy of unwarranted US interrogation and harassment targeting Chinese researchers and students.'