We cannot let another 1984-like event happen in this country, Justice S Muralidhar of the Delhi High Court said today, in a strongly-worded message to the government - at the centre and in Delhi - to work together to combat unrelenting violence that has consumed parts of the national capital for a fourth consecutive day today. At least 21 people have been killed, including an Intelligence Bureau officer whose body was found from a drainpipe in Jaffrabad, and more than 180 have been injured in the clashes.