A bomb blast late Tuesday in India's northeastern state of Manipur killed at least 17 people and wounded more than 30 others.
Local police say the bomb was concealed in a motorcycle outside a police training center in the city of Imphal, the state capital.
Authorities say several people are in critical condition and the death toll is likely to rise.
No one has claimed responsibility for the attack, but there are more than a dozen rebel groups operating in the region.
On Sunday, a grenade exploded outside the fortified home of Manipur's chief minister, Okram Ibobi Singh. No one was hurt.
Separatist violence in northeastern India has killed some 20,000 people since 1979.
Some information for this report was provided by DPA and Reuters.