A bomb exploded in Thailand's mainly Muslim south Sunday, killing two policemen and wounding three other people.

The blast occurred near a border checkpoint in the district of Sungai Kolok in Narathiwat province, one of three mainly Muslim provinces bordering Malaysia.

Two policemen and one villager were wounded and rushed to a hospital.

The blast came just hours after revered Queen Sirikit delivered a televised address late Saturday calling on the public to unite against ongoing violence in the south.

The Bangkok Post newspaper reports the queen said "We have to condemn such actions as being totally devoid of humanity. We have to let these brutes know - without taking arms - what we feel."

Some information for this report provided by AP, AFP and Reuters.