Police in northern Nigeria have arrested three journalists in connection with the killing of nine polio vaccine workers at a clinic last week.
The journalists from radio station Wazobia FM are accused of inciting the killings by hosting an on-air discussion about rumors and conspiracy theories related to the vaccines.
Station chief Sanusi Bello Kankarofi said the three staff members were called to a police station late Sunday, and Kano state police commissioner Ibrahim Idris has confirmed the arrests.
The female workers were killed by gunmen on motorbikes Friday, while giving out polio vaccines at two community health centers in Kano city.
It is unclear who was responsible for shootings, but similar attacks have been blamed on the Islamist militant group Boko Haram.
Some Nigerians in the country's largely Muslim north believe the polio vaccines are used to sterilize young girls or can cause HIV.
Nigeria is one of the three countries in the world where polio remains endemic. Last year, the country reported 121 polio cases, more than the rest of the world combined.