New Jersey Gov. Chris Christie (R) said Sunday that an explosion before a charity run was clearly an act of terrorism.

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"As far as terrorism is concerned, it is clearly an act of terrorism. We just don't know who is responsible for it," Christie said on "Fox News Sunday."

The pipe bomb exploded in Seaside Park, N.J., Saturday afternoon.

No injuries have been reported.

Christie said the FBI is investigating the incident and has "very promising leads."

"It was done intentionally to try to terrorize the people of New Jersey," he said.

"So that we know, but we need to know who is responsible to get them into custody."

The explosion prefaced another in New York City that injured 29 people Saturday evening.

New York City Mayor Bill de Blasio said there is no evidence of a terrorist connection to the incident but that it as an "intentional act."