An undetonated bomb found after an explosion in downtown New York City Saturday night, resembled the same explosive device used by the Boston Bombers in 2013.

Authorities say one bomb was likely placed in a dumpster before it detonated shortly before 9 p.m., injuring 29. New York City Mayor Bill De Blasio said the explosion was “an intentional act,” but cautioned that there was no clear link to terrorism or claim of responsibility. De Blasio described some injuries as “significant.”

After the explosion, New York City counter-terrorism authorities found a second unexploded device fashioned out of a pressure cooker. The second explosive device was found several blocks away from the initial explosion.

A photo circulated on Twitter and later confirmed by police officials, shows the second device was a pressure cooker with wires and a cell phone attached to it.

Boston Marathon bombers Dzhokhar and Tamerlan Tsarnaev also used two pressure cooker bombs placed in backpacks to kill six and maim several hundred others. The brothers constructed their bomb using a manual within popular al-Qaida magazine, Inspire.

The manual the Tsarnaev brothers used is titled “Make A Bomb in the Kitchen of Your Mom.” The manual encourages would-be terrorists to use common household items, such as pressure cookers, to fashion maiming explosive devices packed with shrapnel.

Eyewitness accounts provided to The New York Times indicate most injuries sustained were caused by shrapnel. The shrapnel could have been debris within the dumpster, or placed within the pressure cooker by the bomb-maker.

“It was the biggest blast I ever would imagine, lights flashing, glass shattering,” one woman injured in the explosion told The NYT. “I realized there was blood streaming down my face, and I couldn’t see out of my eye.”

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