Lucknow, Jun 25 (IANS): Four persons were killed and three injured in an explosion on Monday in a junk shop in Uttar Pradesh's Muzaffarnagar district, police said.
Eyewitness accounts suggest that the owner of the junk shop was hammering a pointed object when the explosion occurred.
Muzaffaranagar Senior Superintendent of Police Anant Dev said the Anti-Terror Squad (ATS) and the Army would soon join the probe.