As the authorities sought to identify what had caused the explosion, they described the second device as a pressure cooker resembling the one used in the deadly Boston Marathon bombings in 2013, according to a police official, who spoke on the condition of anonymity to discuss a continuing investigation.

It was unclear whether the blast on West 23rd Street had been caused by the same type of explosive.

In the immediate aftermath, the police shut down a swath of Manhattansouth of Midtown. The area from 14th Street to 32nd Street was closed to traffic between Fifth and Eighth Avenues. But by 7 a.m., only 23rd Street remained closed.

A grim Mr. de Blasio, speaking at a news conference at the scene around 11:15 p.m., said “injuries are significant.” But for the moment, he said, none of them were life-threatening.

Lease payments will be about $2,500 per month, with a $1 buyout at the conclusion of the lease. The vehicle will end up costing EAS $109,830. The first payment will be due at the time of signing the contract, which could occur as early as next week, Closson said.

The new ambulance will be a backup for the primary emergency transfer vehicle, and will be the main vehicle used for nonemergency patient transports, Closson explained. EAS also has an older vehicle, which is used at special events, such as local football games, and also as a secondary backup to the main emergency ambulance.

Ambulance repairs have caused some headaches for EAS over the summer, including the engine blowout Aug. 16 that occurred after the completion of a nonemergency patient transfer. The engine repair reportedly would have cost in excess of $10,000, which is more than the entire vehicle was worth.

Prior to the blowout, another EAS vehicle had air-conditioner problems that have since been addressed. By the end of August, the service had overrun its truck repair annual budget by about $6,000.

Meanwhile, EAS is 11 percent off of its income goal for this fiscal year — making $110,957.02 between April and August, with a goal of earning $360,000 between April and March, according to EAS board’s vice chair, Pat Makielski. These figures apply to money made from services, not proceeds from millages.

Fire Chief Chad Evans said firefighters waited about six weeks from the time tools were ordered until delivery.

"This is the first time Manor has had rescue tools," Chief Evans said. "It'll benefit us drastically."

Currently, volunteer firefighters are aided by Kittanning Township volunteer firefighters for rescue, and have been for more than 24 years - a department that is increasingly sought after.

Assistant Fire Chief Matt Klingensmith said the tools will help rescuers get patients in a trauma center within an hour.

Chief Evans explained the tools can cut to 10,000 PSI and allow emergency responders to cut metal in newer, stronger vehicles.