Here are the latest developments in this big story:
A police vehicle and an educational institution's bus were also set on fire. Several policemen were injured by the stones thrown by the protesters.
Prohibitory orders under Section 144 of the CrPC, which bans assembly of five or more members, have been imposed in Amalapuram. Also, 500 additional policemen have been summoned from surrounding districts.
State Home Minister Taneti Vanitha said instead of feeling proud about inclusion of BR Ambedkar name, anti-social elements were inciting violence, even setting on fire a private school bus.
"It is unfortunate that over 20 police personnel sustained injuries in the incident. We will conduct a thorough investigation into the incident and bring the culprits to book," Ms Vanitha added.
The Minister alleged that some political parties and anti-social elements apparently instigated the arson.
On April 4, the new Konaseema district was carved out of the erstwhile East Godavari.
Last week, the state government issued a preliminary notification seeking to rename Konaseema as BR Ambedkar Konaseema district and invited objections, if any, from the people.
The Konaseema Sadhana Samiti objected to the proposed renaming of the district and wanted the name Konaseema retained.
The Samiti organised a protest on Tuesday and sought to submit a memorandum to the district Collector Himanshu Shukla against the renaming.
Police tried to foil the protest, which apparently infuriated the protesters and violence erupted.