At least 10 bombs exploded at several locations of Narathiwat and Yala provinces on Saturday, barely 24 hours before the constitutional referendum in Thailand.

Narathiwat police chief, Major General Pattanawut Angkanawin, said that the bomb blasts happened between 7.30 pm and 8 pm but there were no injuries or fatalities.

"The bombs which targeted lamp posts caused several areas to be without electricity and knocked out communications system," he told Bernama.

The police chief said the explosions occurred in areas of Sungai Golok, Ranget, Bacho, Chok Airong, Yimgo, Takbai, Chanek, Rusak, Waeng and Muang in Narathiwat.

There was a report of a bomb blast in Yaman district of Yala province.

Police had reported six explosions in southern Thailand which were believed to be a reaction to the referendum on Sunday.

Almost 50 million Thais will cast their votes in the poll on a new constitution which is drafted by a committee led by the country's military junta.