Rep. Peter King appeared on CNN to discuss the New York bomb incident, and said the city is "certainly safe as any big city can be."
New York City is being patrolled by an extra thousand state and National Guard troops because of the United Nations General Assembly and President Barack Obama being in the city, King said.
"As much as you can be guaranteeing anything, New York City is safe," the New York Republican said. "Again, they have to make sure there are no other bombs around, there's nobody else involved, this was not a precursor to follow-up attacks right now — and I don't believe there's evidence of that — but none of that can be ruled out.
"Those I've spoken to very much want to find out whether or not there is any overseas connection or direction from overseas, whether he had any, again, involvement with people overseas... also, whether or not anyone in his family, in his neighborhood, in his circle of friends knew what he was doing (or) assisted him in any way," King said.
King, a member of the Homeland Security Committee, asked, "Where did he get his gun from? All of these supplies he purchased for the bomb, were we aware of what they were being used for? Any of the planning?"
The New York Republican pointed out a cell phone recovered at the bomb site on 27th Street "can be extremely helpful." He said new questions have arisen as the investigation has continued.
"Yesterday, talking to people involved in the investigation, they were pretty certain others were involved. Today, they're not so sure. They're not ruling it out. Hopefully, he's the only one involved in this, but the police cannot, and FBI cannot, assume that and take that for granted."
Authorities will be talking to Rahami's family and neighbors, King said, and "anyone he's been in contact with."
"This is still a very open investigation," the New York representative said.
Regarding the capture of Rahami, King praised the authorities.
"This happened less than 48 hours ago, so the fact it was solved quickly is amazing," he said. "But also that's another reason why the police and the FBI want to make sure nothing was missed."
Authorities are hoping Rahami worked alone, "but they're not sure of that yet," King said.
The unexploded bomb on 27th Street was key in getting fingerprints, the cell phone, and DNA, according to King. King said anyone who might have helped Rahami would be considered co-conspirators.
In an interview with CBS's "Face the Nation," King said the investigation should focus on "the communities where these threats are coming from."