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.
--IANS
md/mag/mr
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