On April 10 also, some unidentified persons had pelted stones at three branches of Andhra Bank in Tamil Nadu.
Unidentified motorcycle-borne men today hurled a petrol bomb at an Andhra Bank branch in Chennai in the early hours today, police said.
Meanwhile, no one was injured in the incident.
The men threw the petrol bomb and fled from the scene, police said.
The incident is suspected to be linked with the gunning down of 20 woodcutters of Tamil Nadu in Chittoor district of Andhra Pradesh last month.
On April 10, some unidentified persons had pelted stones at three branches of Andhra Bank in Tamil Nadu and there were also widespread protests and demonstrations by political parties and right groups in the state against the gunning down of the woodcutters.