A bomb exploded outside army headquarters in the Thai capital on Sunday night, wounding two police officers, authorities said.
The officers had been alerted that someone planted a suspicious package in a phone booth near the army compound, Police Col. Saranyu Prathumraj said. As the officers were attempting to diffuse the device, it went off and injured them, Saranyu said.
No one claimed responsibility for the bomb which exploded a day before Gen. Anupong Paochinda was set to replace outgoing army chief and coup leader Gen. Sonthi Boonyaratglin.
While the motive remained unclear, Thailand has been rocked by both political instability following a military coup in September 2006 which ousted Prime Minister Thaksin Shinawatra, and a bloody Muslim insurgency in its southernmost provinces.