The company issued a statement Wednesday saying they are cooperating with authorities investigating the attack, according to CBS News.
They said the pressure cookers "are not intended to be used for any other purpose other than cooking."
Authorities said Tuesday that the explosives were made from metal pressure cookers stuffed inside black vinyl bags. Photos also revealed a Tenergy battery, wiring, and nails -- which officials said were used to maximize casualties.
Tenergy also issued a statement Wednesday saying their thoughts are with victims and families. "We were appalled to discover that one of our off-the-shelf products was used in such a horrific and senseless act of hate," the company said.