The miscreants fled the spot after hurling the bomb, apparently after a scufle between two groups, police said.
As a precautionary measure, prohibitory orders under Section 144 of CrPC have been imposed and security tightened in the area, a senior police officer said.
"The situation is now under control and police personnel are maintaining a close vigil to prevent any further trouble," he said.
Senior police officers visited the area to take stock of the situation.
Utkal Univsersity Students' Union are slated to be held on September 23.
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