By Ambika Ahuja
BANGKOK (Reuters) - Thailand Prime Minister Abhisit Vejjajiva on Sunday ordered security tightened in Bangkok after two hand grenades exploded outside branches of the country's biggest bank, causing light damage but no injuries.
Four grenades were hurled at four branches of Bangkok Bank Pcl late on Saturday. Two exploded, damaging telephone booths and bank windows, and two were disposed of safely, Abhisit said during his Sunday morning talk show.
The blasts came a night after Thailand's Supreme Court ruled ousted Thai premier Thaksin Shinawatra had enriched himself at the expense of the state during his five years in power, seizing $1.4 billion (918 million pounds) of his family's $2.3 billion in frozen assets.
Metropolitan Police Commander Lt-General Santhan Chayanon said police suspected the attacks were politically motivated but added it was too premature to pinpoint blame on any group.
"We suspect third-hand agitators who want to cause rift between the government and anti-government group at a sensitive time," he told Reuters.
The bank has been targeted recently by anti-government protesters and supporters of the twice-elected Thaksin, who was removed in a 2006 military coup and now lives in self-imposed exile in Dubai after being convicted in absentia of graft.
About 1,000 protesters from the United Front for Democracy Against Dictatorship (UDD), Thaksin supporters who identify themselves by wearing red shirts, gathered outside the bank's headquarters on February 19, forcing it to shut its doors.
They accuse the bank of crony capitalism for what they see as its ties to Prem Tinsulanonda, a former premier and chief adviser to Thailand's revered king. Prem, a former Bangkok Bank adviser, is also accused of playing a role in the coup against Thaksin.
Jatuporn Prompan, a UDD leader, denied any connection between the "red shirts" and the blasts. "We have nothing to gain from this sort of acts," he told reporters.
Abhisit also played down any connection to the red shirts, saying that the attacks were acts of "a small group of opportunists with political objectives."
"I do not believe it has anything to do with (anti-government) protesters," he said, adding he had asked security forces, the police and the military to set up more checkpoints and send out more patrols in Bangkok.
(Editing by David Fox)