Violence broke out in Allahabad University campus on Thursday after a scuffle between two students snowballed into a clash during which some hostel residents hurled crude bombs, the authorities said.
The trouble started in the afternoon when the two students got into an argument and came to blows "over a trivial matter", University Proctor Prof Jatashankar said.
He said he went to the spot and brought the quarrelling students to his chamber and tried to persuade them for a patch-up.
However, the news had spread to their respective hostels by them and the residents came out and exploded a number of crude bombs in front of each other's gates, the Proctor said.
He said the university authorities informed police, who took the two students into custody and raided both the hostels from where more crude bombs were seized.
Several students staying in the rooms from where the explosives were recovered had fled and police have launched a search for them.