Fifteen of the injured, who are the students and the staff of Pondicherry University, had been admitted to a private hospital where the condition of four was stated to be critical. Others were treated as outpatients, police said.
It turned out to be a tragic end for the man, who rode the two-wheeler, as he was to get married in two weeks.
The motorcycle and the university bus, carrying about 30 students and staff, collided head on.
The two-wheeler was thrown off the road due to the impact, killing on the spot the three riders, hailing from Keezhpettai village in neighbouring Tamil Nadu.
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Fearing public wrath, the bus driver jumped out and took to his heels, abandoning the vehicle without bringing it to a halt. He was absconding, police said.
A pall of gloom descended on Keezhpettai as Veeramuthu, who was riding the two-wheeler, had returned to his native village only a few days ago for his marriage.
Traffic came to a standstill for some hours on the busy ECR.