Smith sustained the injury during the Lord's Test in July, and he was sidelined for the remainder of the series before being ruled out of the white-ball tour of South Africa.
"There has been an accidental discharge of weapon resulting in one fatal casuality and one injury to army personnel. Accussed army personnel has been detained. Necessary legal action has been initiated,"District Police Bandipora in Jammu and Kashmir posted on X.
"Mavi is suffering from a back injury and is ruled out of the tournament. The men’s cricket competition will take place from September 28 to October 8 in a T20 format," the Board of Control for Cricket in India (BCCI) said in a statement.
Southee injured his thumb when he dove across with both hands to take England batter Joe Root's catch but saw the ball hit his thumb and deflect to third man.
Australia are waiting to see whether Head will be fit in time to play at the World Cup as head coach Andrew McDonald confirmed after the game that the left-hander had picked up a fracture.
Charith Asalanka sealed Sri Lanka's date with India in the Asia Cup 2023 final after clinching a two-wicket victory in a nerve-cracking chase against Pakistan on Thursday at the R Premadasa Stadium.