Taiwan has tightened security bracing for an expected turnout of 1 million people on the streets of Taipei today to protest against the mainland's Anti-Secession Law to rein in pro-independence forces on the island. A police force of 30,000 - almost half of the island's total - has been mobilised to maintain law and order and protect government leaders taking part in the rally. Leaders expected at the rally include Taiwan's President Chen Shui-bian, who says he will bring his whole family, Vice-President Annette Lu Hsiu-lien and Premier Frank Hsieh Chang-ting. The leaders' participation has prompted the authorities to boost security required for the four-hour march, expected to be the largest demonstration held in a city in Taiwan. Mindful of the election-eve shooting of Mr Chen and Ms Lu during last year's presidential campaigning, a 500-strong security force will be deployed today to form a three-layer human shield to protect the president and the first family. A security source said Mr Chen and his wife, son, daughter and two grandchildren would be asked to wear bullet-proof vests. The Taiwan city government, headed by the opposition Kuomintang mayor, Ma Ying-jeou, has complained about the Presidential Office's approval for a so-called civilian group to hold carnival activities outside Mr Chen's office. 'This will create a loophole in security deployment around the Presidential Office and set a bad example for the future,' said Mr Ma, who was forced to permit the carnival after the insistence of the Presidential Office. Demonstrations have been barred from the area since repeated Democratic Progressive Party protests in the past. Mr Hsieh yesterday assured the legislature that everything would be kept under control. Legislators of the pro-independence Taiwan Solidarity Union urged Speaker Wang Jin-pyng of the KMT to join them in the protest. Mr Wang has so far declined to say whether he will attend. But most opposition politicians, including People First Party chairman James Soong Chu-yu and KMT chairman Lien Chan, will not attend.