Two of them, a police officer and a member of the public, are in the neurosurgery ward, while the other two, a Dutch reporter and a member of the public, are in the surgery ward.
During the night, 19 regular and 8 special teams of the ambulance service were on the streets of Belgrade.
Serbian Minister of Health Tomica Milosavljevic praised the highly professional work of the Emergency Room employees and those at the Institute for Emergency Medical Care.
He also sent a message of congratulations to the employees for their dedication and efficiency, wishing that the injured recover soon and return to their homes, and that such incidents are never repeated again.