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 building explosive devices and stashing them on Manhattan rooftops and the Williamsburg Bridge has been indicted on weapons-related charges, authorities say. Michael Gann allegedly made at least seven improved explosive devices (IEDs) using precursor chemicals — chemicals that can be combined into an explosive mixture — that he bought online.