Sikh militants in the northwestern state of Punjab killed at least 12 people, including a politician who had survived two earlier assassination attempts, news reports said Saturday.

Suraj Prakash Malhotra, a local leader of Prime Minister Rajiv Gandhi's Congress Party, and Gajjan Singh, a state leader of the Communist Party of India, were among the victims in a series of attacks, Press Trust of India said. Militants have waged a bloody insurgency for an independent Sikh nation since 1982.