Sangareddy:Communal violence broke out in Sangareddy town of Andhra Pradesh late Thursday night,and police to clamped indefinite curfew in the area.

Twenty people were injured and several shops were set afire in the town, about 70 km from Hyderabad.

The violence broke out when a youth allegedly posted on Facebook a provocative photograph of a place of worship. Even as a group of people was staging a agitation outside police station demanding his arrest, a mob started attacks on shops and vehicles at Old Bus Stand.

The rampaging mob set afire 40 shops, two four-wheelers and four auto rickshaws. It also looted several other shops and small road-side kiosks. A police vehicle was also fired.

20 people including few policemen were also injured in the stone pelting by two groups.

Police also called additional forces from other parts of the district. As a precautionary measure, security has been tightened in other towns and districts.