An Iranian prosecutor has ordered further investigation into the jailhouse death of a Canadian journalist, one week after two intelligence officers were charged in connection with the incident.

The Iranian news agency (IRNA) says a top lawyer in the Tehran prosecutor's office sent the file on the death of journalist Zahra Kazemi back to investigators Monday because it was incomplete. The news report did not offer details.

Iranian officials said last month that 54-year-old Zahra Kazemi, a Canadian national, died July 10 in Tehran from a brain hemorrhage caused by a blow to the head. She received the blow sometime after her June 23 arrest for taking photographs of protests outside a notorious Tehran prison.

Last week, reformist lawmaker Mohsen Armin alleged that Ms. Kazemi was struck by an unnamed judiciary official. He also alleged that 20 to 25 witnesses to the assault were detained for two days to ensure they retracted their statements.