21st-century India is facing the Naxalite-Maoist rebels, in the words of Prime Minister Manmohan Singh, India's "greatest internal security challenge", and other terrorist tensions (such as Islamist terrorist campaigns in and out of Jammu & Kashmir and terrorism in India's Northeast). Terrorism has increased in India, with bomb blasts in leading cities like Mumbai, New Delhi, Jaipur, Bangalore, and Hyderabad. In the new millennium, India improved relations with many countries and foreign unions including the United States, the European Union, Israel, and the People's Republic of China. The economy of India has grown at a very rapid pace. India was now being looked at as a potential superpower.