A grenade exploded on Tuesday outside the party headquarters of Thailand's embattled prime minister, injuring two policemen, officials said, as mass anti-government protests paralysed central Bangkok.
"The grenade was fired and landed in the parking lot behind the party headquarters, wounding two policemen," said Democrat party spokesman Satit Pitutacha.
Satit said the men were not seriously hurt and had been taken to a local hospital for treatment. Another party spokesman said shrapnel had hit one of the men in the chest.
Politicians had gathered at the base near the finance ministry to mark the party's 64th anniversary, but Prime Minister Abhisit Vejjajiva was not present because he is based at an army barracks during the protests, said Satit.