Aung San Suu Kyi, chairperson of the National League for Democracy (NLD), has won Myanmar's parliamentary by-elections and her party's other candidates also swept almost all parliamentary seats, the NLD headquarters announced Sunday night.

Suu Kyi won 1955-45 against U Soe Min, candidates of the Union Solidarity and Development Party (USDP), in Yangon region's Kawhmu township constituency, securing a seat of House of Representatives there.

According to the results released so far, other NLD candidates also won in all remaining five constituencies in Yangon region -- Mayangon, Mingala Taungnyunt, Hlegu, Thongwa and Dagon Seikkan as well as in 15 other township constituencies in other regions or states including the four townships in Nay Pyi Taw for the seats of House of Representatives.

More results are expected to be released soon.

The result was available hours after the polling was closed in the afternoon at 4 p.m. (9:30 GMT), followed by counting of votes in the presence of polling station officers, candidates' election agents and 10 witnesses from the public.

The parliamentary by-elections in Myanmar, which began on Sunday morning, were contested by a total of 157 candidates -- 150 represent 17 political parties and seven independent candidates -- for the 45 vacant seats of parliamentary representatives scattered in 45 township constituencies in nine regions or states -- Yangon, Mandalay, Ayeyawaddy, Sagaing, Tanintharyi, Bago, Magway, Mon and Shan as well as Nay Pyi Taw directly under the president's administration.