A statement broadcast on Thai television late Tuesday says forces loyal to Thailand's king had taken control of Bangkok and would decide on political reforms.
Prime Minister Thaksin Shinawatra is in New York for the United Nations General Assembly meeting. Just before the military announced it had control, government-owned television carried a statement from the prime minister declaring a state of emergency.
Witnesses report troops and tanks at key locations throughout the Thai capital.
In April, Mr. Thaksin dissolved Parliament and called elections after weeks of demonstrations calling for his resignation. The opposition boycotted the election, however, and the courts later deemed the poll illegal.
Some information for this report provided by AFP, AP and Reuters