Amza was being escorted to his car after the felicitation by the Andhra Chamber of Commerce late on Monday evening when the Periyar Dravidar Kazhagam (PDK) activists assembled in front of the vehicle and started shouted slogans against him, police said on Tuesday.
The group blocked his way for about 20 minutes before police and organisers stepped in and made way for Amza's exit.
The protesters caused some minor damage to the envoy's car, they said.
However, no case was registered following a request from Amza, police added.
