The 32-year-old man, identified as Tapash Biswas, was arrested for allegedly attempting to rape the girl in a common bathroom of the quarters of the casual employees of BESU, the sources said.
The girl had gone to take a bath when Biswas entered and allegedly tried to rape her. Her cries for help alerted nearby people who rushed to the spot and caught hold of him, they said.
Biswas was arrested after BESU Registrar Biman Banerjee lodged a complaint against him.
One youth has been arrested in this connection, they added.