US officials are looking for Ahmad Khan Rahami, a naturalised US citizen who was born in Afghanistan, for questioning over explosions in New York and New Jersey on Saturday.
The bomb which hit Manhattan's Chelsea district in the evening injured 29.
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Earlier on Saturday a pipe bomb exploded in a New Jersey shore town ahead of a charity race.
The FBI has been searching an address in Elizabeth, New Jersey, connected to the 28-year-old suspect.
A backpack containing up to five devices exploded in Elizabeth in the early hours of Monday when a bomb disposal robot tried to deactivate it.
What we know so far
New York Governor Andrew Cuomo said there were "certain commonalities" between the bombs.
New Jersey State Police said that the FBI was linking the Manhattan explosion and that in Seaside Park, New Jersey.
Investigators have warned that the suspect should be considered "armed and dangerous".