His lawyer Bright Rikhotso said he could not comment as he was not aware of the probe.
A Hawks official told Sunday World that Bushiri became a person of interest after witnesses in the church leadership came forward with information.
The official said the church leaders who came forward said the church spirits away about R15-million every month.
"Our investigation also found that when the money arrives in Malawi, it is not taken to any bank there. It gets cleaned illegally into different businesses."
The official said some of the witnesses were allegedly intimidated by Bushiri and his staff when they wanted their agreed payments for giving false testimonies during church services.
"According to the witnesses, everything that happens in the church is planned. People are bought to testify, they are bought to act sick and crippled and later give testimony that they were healed by prophet Bushiri," he said.
The official said the whistle was blown when these fake-testimony workers started seeing the money that the church was making out of their testimonies and wanted their fair share.
"It is different people every Sunday. The other witness said she demanded R100000 for testifying about Bushiri's prayer that helped her get out of ITC blacklisting.
"We all know that it is impossible, but gullible and desperate people believe these things," he said.