The two men allegedly fled the spot before the man could respond. (Representational)

Two unidentified men in Uttar Pradesh's Greater Noida allegedly fled with the motorbike of a man who stopped along a roadside to urinate, police said.

The incident took place around 2.30 pm when Aakash was on his way to the industrial area in Greater Noida for work and the scooter-borne duo took his motorcycle, they said.

"He was near Tilpat A chowk, under the Surajpur police station area, when he stopped to urinate on the road. He had left the key on the motorcycle when suddenly two men arrived on a red-coloured scooter and one of them got on the bike and they fled the spot before Aakash could respond," a police official told news agency Press Trust of India.

A complaint has been made by the man and a complaint under Indian Penal Code section 379 (robbery) has been registered at the Surajpur police station, he said.

A probe is underway, the official added.