This Fourth of July, while revelers were distracted by a fireworks display over the East River in New York City, smart bank robbers took the opportunity to saw a giant hole in a bank roof on the Lower East Side and steal some cash. After all, no one was watching.

According to a report by the New York Post, the robbers were able to reach the roof by climbing a ladder that was connected to a construction site on an adjacent roof.

Inside, they made off with cash from a vault they were able to break open, the sources said.

But they failed to crack another locked safe where the big bucks were stashed, ­according to the sources.