Hong Kong police say missing book editor Lee Bo has returned home following his disappearance in a case that rattled civil liberties advocates in the territory.

A police statement said Lee returned Thursday from the Chinese mainland and met with officers as part of an investigation.

It said Lee did not provide thorough information about his departure from Hong Kong but said he had gone to the mainland to assist in a court case against a friend and had not been abducted. The statement said Lee told officers he had been safe and free while on the mainland but gave few details.

Lee was one of five Hong Kong-based men associated with a publishing house the produced works about China's Communist leadership that were banned on the mainland.