NEW : High tide sends water flooding into Bangkok 's Chinatown area . The prime minister says Bangkok is entering a critical crisis . A holiday was declared so that residents could flee to safer ground . Flooding has killed 300 people and affected more than 1 million .
NEW : High tide sends water pouring into Bangkok 's Chinatown area . The prime minister says Bangkok is entering a critical stage . A holiday was declared so that residents could flee to safer ground . Flooding has killed 373 people and affected more than 9.5 million .