Nearly a million travelers passed through Hong Kong's sea, land and air control points on Tuesday, the first day of the seven-day National Day Golden Week holiday, according official data.

Data from the Immigration Department of the Hong Kong Special Administrative Region government showed that that 931,175 travelers—565,589 arrivals and 365,586 departing passengers--went through the territory’s immigration control points yesterday.

The arrivals included 221,644 visitors from the Chinese mainland while those who left included 200,307 Hong Kong residents.

The Travel Industry Council of Hong Kong earlier estimated that between 1.15 million and 1.2 million mainland tourists will visit Hong Kong during the seven-day holiday period.

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Lo Wu had the busiest control point yesterday, handling 205,307 travelers while the Lok Ma Chau Spur Line came in second with 168,721 travelers.

The Hong Kong International Airport also saw heavy passenger traffic with 61,533 travelers flying out of the city while 63,394 passengers arrived.

The Immigration Department had said that it expected around 10.03 million passengers to pass through Hong Kong during the festive period from Sept 28 to Oct 7.

READ MORE: Mainland visitors expected to increase by 20% during Golden Week

Anticipating the heavy passenger traffic, the department minimized leave for frontline officers and deployed additional security guards to provide crowd management support.

The frequency of MTR trains was also increased after the fireworks display on Tuesday night while local public transport operators arranged spare vehicles to meet the needs of cross-boundary travelers, according to the Transport Department.