The New York City Comptroller’s Office found no evidence that Donald Trump donated to two 9/11 charities in the year after the attacks, despite Trump’s 2001 promise on-air to Howard Stern that he would donate $10,000 to the Twin Towers Fund.

“My office has reviewed the donations made in the nearly 12 months following the attacks – and we didn’t find evidence that he contributed a single cent to the victims, our first responders, and to our city through the Twin Towers Fund,” the office of City Comptroller Scott Stringer, a Democrat, told ABC News Friday.

Weeks after the 9/11 attacks, Trump appeared on Howard Stern’s radio show, which at that point was carried by dozens of stations nationwide. He promised to contribute to Stern’s charity effort for survivors of the attack, first responders, and their families.

Stringer’s audit encompassed every donation made to the Twin Towers Fund between Sept. 12, 2001 to Aug. 31, 2002. Another audit, of New York City Public/Private Initiatives Inc., which was operating as the Twin Towers Fund, covered Sept. 12, 2001 to June 30, 2002.

Though Trump may have donated to either organization outside the timeframe of Stringer’s audits, he did not respond to ABC for comment.

“In the wake of 9/11, New Yorkers came together, healed, and rebuilt. If Donald Trump claimed to donate and didn’t, if he claimed to support New Yorkers in a time of crisis and refused, then that would be just plain wrong,” Stringer’s office told ABC.