Imam Syed Fakhruddin Alvi urged the more than 100 men gathered at the Muslim Community Center of Union County to be vigilant in leading their families and children away from evil.
Mosque leaders called bombing suspect Ahmad Khan Rahami, an Afghanistan-born US citizen whose father is an active member of the mosque, misguided and said people who follow extremist teachings are criminals.
Mosque members said Rahami's father frequently prays there, including this week after Rahami was injured by police in a shootout in Linden hours after he was named the suspect.
He will first face federal charges in New York when he is out of the hospital. A public defender has sought a court appearance for Rahami so he can hear the charges against him.
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The suspect's father, Mohammad Rahami, said his son was a changed person after visiting Afghanistan and Pakistan in 2013. He said he told the FBI in 2014 about his son's apparent radicalisation after household tensions led to a fight in which another of his sons was stabbed.
FBI agents interviewed the father in 2014 after Ahmad Rahami's arrest on charges later dropped that he stabbed one of his brothers in the leg. The FBI initiated contact because the father had expressed concern to someone following that episode over his son's internet use and some of his associates.
When Ahmad Rahami was arrested, prosecutors said he was carrying a journal that praised Osama bin Laden and other Muslim extremists, fumed about what he saw as the US government's killing of Muslim holy warriors and declared, "Death to your oppression."
Mohammad Rahami said he and his family were in a state of shock following last weekend's blasts, which injured 31 people.