The police force in Tanzania has been placed under investigation over suspected involvement in the suspicious deaths of 22 people since the beginning of the year.
President Samia Suluhu Hassan said no police officer should be involved in the probe, which she ordered be handled by the home affairs ministry.
She said she was alarmed by the reports of police misconduct.
In late January, seven police officers were charged with the beating to death of 25-year-old businessman Mussa Hamisi.
The officers, who have not yet been asked to plead in the case and are in remand custody, are accused of stealing $57,000 (£42,000) from the victim during a search.
When he protested and demanded his money back, they are alleged to have attacked him.
