Additional Superintendent of Police Rajesh Singh Chandel said police have arrested 31 activists of NSUI, the students wing of Congress party.
The Budget Session of the Assembly started today.
The NSUI tried to gherao the legislature building by crossing the barricade.
Police resorted to a cane-charge when they climbed the barricades and threw stones at them and the mediapersons.
Five policemen were injured, two of them seriously. They were admitted to a hospital, Additional Superintendent of Police Rajesh Singh Chandel told PTI.
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Bhopal district NSUI president Ashutosh Chouksey said when the activists were climbing the barricades in their attempt to enter the Assembly premises "peacefully", police caned them, injuring many.
"I myself sustained injuries and got discharged from the hospital just now," he said.
Chouksey also stated student elections have not been held in colleges for more than seven years. So the students had no voice while the ABVP, BJP's student wing, was ruling the roost as the party is in power.
"This is the reason the polls are not being held," he claimed.