The blast took place at Rameshwaram Cafe during peak lunch hours, a time when the eatery was bustling with customers.
An improvised explosive device went off inside the eatery, Karnataka Chief Minister Siddaramaiah told reporters, Xinhua reported.
"An unknown person carried a bag to the restaurant. He had bought a token and consumed food. Later, he left behind the bag which carried the bomb. The police are examining closed-circuit television cameras," Siddaramaiah said.
According to the police, the nine injured were sent to Brookfield Hospital and their conditions were reported to be stable.
MP/PR