Hours before Mr. Rahami’s name was released, the police discovered five pipe bombs near a train station in Elizabeth, detonating one of them overnight as they sought to disarm them. Before dawn, agents conducted a series of raids in the New Jersey city.

Law enforcement officers closed and evacuated the La Bottega Dei Sapori Deli Grocery and Sonia’s Beauty, a salon to the left of the restaurant, as well as HR Computer and Communication Services Inc.

Mr. de Blasio said New Yorkers should be prepared to see a large increase in police presence across the city.

“In the coming hours we are going to be able to say a lot more about what happened here,” Mr. de Blasio said Monday during an interview on “Good Morning America.” “It is certainly leaning more in the direction that this was a specific act of terror.”

When firefighters returned after learning the call was a false alarm, police say they discovered the station had been burglarized. Personal property was taken from the firehouse including laptop computers, tablets and cell phones.

Police say none of the City of Milwaukee property, such as televisions, firefighting equipment, or other items from the firehouse, were stolen.

According to police, the burglar(s) were able to enter through an open window.

Firefighters are now taking the proper precautions at the fire station to make sure this does not happen again.