At first, what explanation did the US give for the presence of the U-2 plane in Soviet airspace?

At first, The United states denied it by saying that we didn't notice the existence of the plane and tried to blame it on the weather to explain the crash

But during the world-leaders meeting at paris, president Eisenhower admitted that the weather explanation was false. (Not that he had any other choice because there are evidence of photos on the surviving pilot that being captured)