Hong Kong under tight security for Chinese official's visit

The chairman of the Standing Committee of China's National People's Congress, Zhang Dejiang, right, speaks to media next to Hong Kong's Chief Executive Leung Chun-ying after arriving at Hong Kong's airport, Tuesday, May 17, 2016. Hong Kong authorities have rolled out a massive security operation as they brace for protests during a top Beijing official's visit to the semiautonomous Chinese region. Thousands of police officers were deployed Tuesday as Zhang Dejiang began a three-day trip to Hong Kong. (AP Photo/Kin Cheung) (The Associated Press)

The chairman of the Standing Committee of China's National People's Congress, Zhang Dejiang, right, walks with Hong Kong's Chief Executive Leung Chun-ying after arriving at Hong Kong's airport, Tuesday, May 17, 2016. Hong Kong authorities have rolled out a massive security operation as they brace for protests during a top Beijing official's visit to the semiautonomous Chinese region. Thousands of police officers were deployed Tuesday as Zhang Dejiang began a three-day trip to Hong Kong. (AP Photo/Kin Cheung) (The Associated Press)

The chairman of the Standing Committee of China's National People's Congress, Zhang Dejiang, center, speaks to media next to Hong Kong's Chief Executive Leung Chun-ying, second left, after arriving at Hong Kong's airport, Tuesday, May 17, 2016. Hong Kong authorities have rolled out a massive security operation as they brace for protests during a top Beijing official's visit to the semiautonomous Chinese region. Thousands of police officers were deployed Tuesday as Zhang Dejiang began a three-day trip to Hong Kong. (AP Photo/Kin Cheung) (The Associated Press)

Hong Kong authorities have rolled out a massive security operation as they brace for protests during a top Beijing official's visit to the semiautonomous Chinese city.

Thousands of police officers were deployed Tuesday as Zhang Dejiang began a three-day trip to Hong Kong.

Zhang is the chairman of the National People's Congress, China's parliament. He is the highest-ranking Communist Party official to come to Hong Kong since then-President Hu Jintao paid a visit in 2012.

Zhang arrived at Hong Kong's airport at midday, giving a short speech before departing by car.

Hong Kong has seen increasing discontent with Beijing's tightening grip on the former British colony, including pro-democracy street protests that gripped the city in late 2014.