According to newspaper South China Morning Post, Pu had been criminally detained by Beijing police after attending a meeting to commemorate the 1989 crackdown on democracy as well as "explore its implications and consequences and call for an investigation into the truth of June 4.’’ 
Kwa mujibu wa gazeti la South China Morning Post, Pu amekamatwa kama mhalifu na plisi wa Beijing baada ya kuwa amehudhuria mkutano wa kuadhimisha kuminywa kwa demokrasia pamoja na "kurudusu maana na matokeo yake na kutoa wito wa uchunguzi wa kina kuhusu ukweli wa yaliyotokea siku ya Juni 4.’’