First I've heard of this.
In Heavy Fog
...
...When the Empire State Building emerged from the fog right ahead of his craft, Smith banked his plane and pulled back as hard as he was able, but the bomber lacked the maneuverability to dodge the large tower looming over it. At 9:49 a.m, in the middle of a desperate, climbing turn, the ten-ton B-25 slammed into the 79th floor of the Empire State Building.
...“That day, as we were getting ready to take our coffee break, we heard this terrible noise, and the building started to shake. … As we looked out our third-floor window, we saw debris fall on to the street. We immediately thought New York was being bombed.”
...The impact left a hole in the north face of the Empire State Building eighteen feet wide by twenty feet high....