India, Nov. 10 -- Entire Uttar Pradesh and Maharashtra have been put on alert after the blast in a car near Gate no 1 of the Red Fort or Lal Quila Metro station in Delhi that killed at least eight people and left several others injured.

Delhi was also immediately put on a high alert after the explosion, cause of which is yet to be ascertained. Track Red Fort blast live updates

Other districts in Maharashtra have also been put on a precautionary alert.

Uttar Pradesh ADG Law and Order Amitabh Yash said that the DGP has issued instructions to all senior officials in Uttar Pradesh to increase security at sensitive religious sites, sensitive districts, and border areas.

"All security agencies have also been alerted. Police in all districts...