A Facebook post that criticized Islam's Prophet Muhammad sparked a riot in southern Bangladesh on Sunday that left at least four people dead.
Hundreds of Muslims took to the streets in the town of Borhanuddin, 195 kilometers (120 miles) from the capital, Dhaka, to protest the offensive social media post allegedly written by a Hindu man.
A local official said a meeting was held on Sunday to try to defuse the tensions that began Friday as the Facebook post gained traction.
But the angry protesters started attacking security officials, prompting them to retaliate.
Tear gas deployed
As the protest descended into further violence, police used tear gas and rubber bullets to disperse the crowd.
"We fired blank shots in self-defense when some people started throwing stones at our officers, forcing us to take shelter in a building," said Sarkar Mohammad Kaisar, superintendent of police in Bhola.
Officials said 50 people were injured, including around 10 police officers.
Bangladesh's leading newspapers reported that around 100 people had been wounded.
The protesters, mostly conservative Muslims, were angered that the Facebook post criticized Muhammad and his youngest daughter.
Call for revenge
"This beast has condemned our prophet and his daughter Fatima by name ... Let the almighty compel the judges to hang this person," one person wrote in a Facebook post, calling for a protest against such "arrogance."
Other Facebook users chimed in to support the post.
The man denied making the comment, saying his Facebook account had been hacked.
Police later detained three people for alleged hacking.
Communal tensions often pop up in Muslim-majority Bangladesh, with minority groups saying they face discrimination.
mm/jlw (AFP, AP, dpa, Reuters)