They say they have evidence linking Mr Mazzaro, who is on the run from them, to Mr Migliore.
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Police suspect Mr Mazzaro and two other leading members of the supporters group of carrying out the attack.
Vin Mazzaro tossed two scoreless innings and Jason Grilli retired Ruben Tejada with two on, making him perfect in 14 save chances this season.
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Mr Migliore, who played for Boca Juniors until 2008, is suspected of aiding Maximiliano Mazzaro, a member of a group of hardcore Boca Juniors fans.
Mr Mazzaro is wanted in connection with the 2011 death of 56-year-old Ernesto Cirino, who died of injuries sustained during a beating in a neighbourhood row.
Police are searching for Mr Mazzaro on suspicion of murder.
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