"The situation in Bangkok has normalized, the government will continue to make steps to ensure security in the country," the ministry said.
Bangkok was hit by mass protests by the opposition demanding that Prime Minister Abhisit Vejjajiva step down.
Exiled former prime minister Thaksin Shinawatra, whose supporters have been rallying against the government, said Monday that several demonstrators were killed in the military's crackdown on protests.
Protests in Thailand started in March after the government allocated 9 million low-paid Thai workers assistance worth $55 each to stimulate the economy. Protesters called the aid "bribery," accusing Cabinet ministers of coming to power illegally and demanding that Vejjajiva step down.
Over 100 people were injured in the protests.
On April 10, an ASEAN summit, due in Pattaya, was postponed over mass demonstrations.
