Thailand's anti-corruption commission office attacked by grenades ahead of PM's defense

Police say a grenade was thrown into Thailand's anti-corruption office in what apparently is the latest in a string of politically related attacks.

Police Gen. Ake Angsananont says a building in the compound was slightly damaged but there were no injuries from the incident, which occurred Thursday night at the National Anti-Corruption Commission in Nonthaburi province, outside Bangkok.

Police seized a cache of weapons and arrested four pro-government protesters during an overnight raid at a house close to the office. They were investigating whether those arrested were linked to the attack.

The NACC has accused Prime Minister Yingluck Shinawatra of negligence in failing to prevent corruption and massive losses in the government's rice subsidy scheme. Yingluck is due to submit her defense to the agency Monday.