Who is bombing suspect Ahmad Khan Rahami?

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ELIZABETH, N.J. -- Muhammed Rahami, the father of 28-year-old Ahmad Khan Rahami, appeared to be distraught Monday afternoon.

His son is at the epicenter of a major terrorism investigation in New Jersey and New York.

"The city of Elizabeth has gone through a difficult time over the last few hours," Elizabeth Mayor Chris Bollwage said. "But it's because of the responsibility of law enforcement, the FBI, the Prosecutor's Office, state police,  sheriff's office where we quickly apprehended this man in Linden."

But by nearly every account, Rahami was described as a nice guy, quiet for the most part and someone who mostly kept to himself.

He worked for his father's restaurant: First American Fried Chicken in Elizabeth, New Jersey. Officials say Rahami lived there above the family restaurant with his father and mother.

"He's always the most friendly person you would ever meet which makes it scary," one customer said.

His quiet nature does not fit the image being plastered across televisions Monday evening.

Armed and dangerous, he was named the main suspect in the Chelsea bombing that injured 29 people. He is also being investigated for another pipe bomb in Seaside Heights and for dumping five pipe bombs just less than a mile from his home.

"Very scary" one neighborhood said. "Too close too home."

Little is known about Rahami as investigators dissect through his social media activity and analyze numerous trips he made to his native country of Afghanistan. FBI officials say he is a naturalized U.S. citizen, who came to the country from Afghanistan with his family almost 20 years ago.  He is a graduate from Edison High School.

In 2011, the family had filed a federal lawsuit against the city of Elizabeth and its police department, claiming they were being discriminated against for being Muslim and that police were trying to shut them down. The complain was eventually dismissed.

"They were disruptive in the neighbor for many, many years," Bollwage said. "The city council attempted to address it. They did."