A 55-year-old man was indicted Tuesday after creating and placing at least seven improvised explosive devices in different areas of New York City, including subway track on the Williamsburg Bridge and on a Manhattan rooftop,

Michael Gann, 55, of Inwood, New York, was charged with manufacturing at least seven improvised explosive devices, prosecutors said on July 22.

A man accused of making and attempting to use improvised explosive devices in Manhattan is facing multiple charges, according to the United States Attorney’s Office. Michael Gann, of Inwood, assembled at least seven IEDs by mixing potassium perchlorate and aluminum powder,