Just in: Violence erupted in Manipur's Churachandpur district this evening over the Inner Line Permit issue.

The houses of three lawmakers have been set on fire, reports NDTV. Mobs have prevented the police and fire engines from reaching the spot.

The Inner Line Permit is an official travel document issued by the Government of India to allow inward travel of an Indian citizen into a protected area for a limited period. It is obligatory for Indian citizens from outside those states to obtain permit for entering into the protected state.

Indian citizens need a Nagaland-issued ILP if entering Manipur by road via Dimapur or Kohima. However, demands by the Manipur government for the introduction of the provision of an Inner Line Permit system to restrict entry of outsiders into the state were refused, according to Wikipedia. 

Details awaited. 

Read: Inner Line Permit: Why Manipur is on the boil again