Home Ministry says, terrorism in the hinterland and communal situation remained by and large under control in 2011-12, except for the serial bomb blasts in Mumbai in July 2011 and bomb blast in Delhi High Court in September last year.

However, it says, Maoists violence, militancy in Jammu and Kashmir and insurgency in the Northeast continued to be the top areas of concern for the country's internal security with Left wing extremism claiming the most lives.

In its Annual Report, the Home Ministry said the North eastern region which has remained complex for quite some time because of diverse demands advocated by various militant outfits, has shown improvement in 2011.

It said the Government has adopted various counter terrorism strategies to neutralise the efforts and capabilities of militants to disturb peace in the country.