The explosion and the second device have some similarities with bombs used at the Boston Marathon in 2013. According to multiple reports, both the second device in Chelsea and the Boston bombs were fashioned out of the same style of kitchen device.
According to a 2013 report by the New York Daily News, the bombs at the Boston Marathon were created from pressure cookers filled with nails and ball bearings, and concealed in black nylon bags left on the sidewalk near the finish line of the race.
The Boston Marathon bombs "sprayed a leg-level pattern a shrapnel that ripped into flesh, severed limbs and caused injuries that most doctors have never seen," the New York Daily News reported. The devices that exploded in the 2013 Boston Marathon bombing killed three people and injured more than 260.
Though no information on the contents of the second device in Chelsea has been released, images of the device circulated on social media, depicting a pressure cooker with wires and a cellphone attached, quite similar to the bombs used in Boston.
Additionally, the first explosion in Chelsea ended with injuries caused by shrapnel from the blast, though there have been no reports on the make of the shrapnel. It's also not been officially confirmed that the first explosion and the second device are connected.
While there are some striking similarities, there's one important point to note. After the Boston Marathon bombings, many speculated on the possibility that the bombers were linked to terrorist organizations. However, New York City Mayor Bill de Blasio stated at a news conference that the explosions were an "intentional attack" but at the moment there was no "connection to terrorism and no immediate claim of responsibility."
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