The accused, identified as Bhuvna Ram and Narayan Ram, were nabbed from near Osian area here, police said.
The two are supporters of Maderna and had gone to visit him in Mathura Das Mathura hospital in Jodhpur city where he is undergoing treatment after being admitted yesterday for chest pain, they said.
Late last night, police had arrested two persons in connection with the attack. They were identifed as Arjun Ram and Anada Ram.
Some reporters were trying to talk to Maderna's daughter Divya on the Bhanwari issue outside the hospital yesterday when about 20-25 of his supporters targeted them.
Police said two persons received minor injuries while an OB van of a news channel was damaged. The injured were Devankur of Headlines Today and a driver of the OB van of Star News.
Few supporters of Maderna also ransacked an under-construction office of a vernacular news channel ETV, they said.