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BANGKOK, Thailand (CNN) -- Tanks rolled through the streets of Bangkok, Thailand, on Tuesday amid reports of an attempted coup, witnesses tell CNNMembers of the Thai military are attempting to seize power but Thailand's leadership expects everything to return to normal soon, Deputy Prime Minister Surakiart Sathirathai told CNN. Thai Prime Minister Thaksin Shinawatra -- currently at the U.N. headquarters in New York -- went on a government-owned TV station and declared a state of emergency, The Associated Press reported. The government has maintained control of the capital and the surrounding areas, according a statement on Thailand's state-controled Army television. The statement asked for residents to remain calm and await further announcements. According to officials at the Thai mission at the United Nations, Thaksin has moved up his speech to the General Assembly to Tuesday night and will return to Bangkok after his addressHe had been scheduled to address the assembly on WednesdayThailand operates as a constitutional monarchy, with the king as head of state and the prime minister leading the government. The country is an ally of the U.S. and contributed troops to the U.S.-led military operations in Iraq and AfghanistanThaksin has been under considerable pressure to step down. Elections in Thailand are scheduled for November after the country's constitutional court ruled April's vote was unconstitutionalThaksin had called for the elections in April, three years early, after opponents accused the billionaire leader of abusing the country's system of checks and balances and bending government policy to benefit his family's business