According to Home Ministry officials, the alerts were also sent to all states on February 19 and 20, that Pakistan-based terrorist groups may carry out attacks in a major city to avenge the hanging of 26/11 terrorist Ajmal Kasab and Parliament attack convict Afzal Guru.
They said the central security agencies had sent an advisory on Tuesday asking all states to tighten security in sensitive places as Lashkar-e-Taiba, Jaish-e-Mohammad and Hizbul Mujahideen may launch attacks.
