The signboard of the LTTE's political office in Mannar town was damaged by another group of Muslims around midnight, Police said.
Two men were riding a motorbike from Mannar towards their village near Pesalai Thursday night around 8.30 when one of them, Mr. Faisal Saleem, was shot dead by gunmen who had trailed them on another motorbike.
The two men are from the coastal Muslim village of Karisal on the western part of Mannar island.
"Associates of the dead man gathered together and attacked the LTTE office on Moor Street when his body was brought to Mannar base hospital", a Police officer said.
Curfew would be in effect until 6 p.m. according to Mannar Police.