The injured NANS members were later taken to the National Hospital for medical care.
Meanwhile, a report on Friday also suggested that operatives of the Department of State Services on Thursday intercepted some NANS members and recovered two pump action guns and cartridges from them on their way to the convention.
Following the attack on the National Hospital on Friday, the major roads leading to the ICC and the National Hospital have been deserted, while the police have condoned off some sections of the highway.