THE STANDARD RIFT VALLEY Naivasha police commander Samuel Waweru. [Courtesy] Police have launched a manhunt for a businessman suspected to be behind a spate of highway robberies along the Naivasha-Mai Mahiu highway that targets goods on transit. Naivasha police commander Samuel Waweru said based on information they got from one of the suspects in their custody, a trader whose identity has been concealed so as not to jeopardize the ongoing investigations, is the mastermind behind the armed robberies. The trader is said to have gone into hiding after a suspect was arrested during a botched robbery on the highway last Sunday night.