Revellers take part in a water fight during Songkran Festival celebrations at Kowloon City district is known as Little Thailand as there is large number of restaurants and shops run by Thais April 12, 2015. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck. (Photo by Tyrone Siu/Reuters)

Revelers use water guns as they participate in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 12, 2015. (Photo by Athit Perawongmetha/Reuters)

Revellers splash water onto passing motorists during Songkran Festival celebrations at Kowloon City district is known as Little Thailand as there is large number of restaurants and shops run by Thais April 12, 2015. (Photo by Tyrone Siu/Reuters)

Children use water guns as they participate in a water fight during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, April 12, 2015. (Photo by Tyrone Siu/Reuters)

A reveller reacts as she participates in a water fight during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, April 12, 2015. (Photo by Tyrone Siu/Reuters)

Revellers use water guns as they participate in a water fight during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, in Hong Kong April 12, 2015. (Photo by Tyrone Siu/Reuters)

A police officer gets sprayed by water guns during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, in Hong Kong April 12, 2015. (Photo by Tyrone Siu/Reuters)

Revellers take part in a water fight during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, April 12, 2015. (Photo by Tyrone Siu/Reuters)

A reveller reacts as he gets sprayed by water guns during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, in Hong Kong April 12, 2015. (Photo by Tyrone Siu/Reuters)

Revellers take part in a water fight during Songkran Festival celebrations at Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, in Hong Kong April 12, 2015. (Photo by Tyrone Siu/Reuters)

Water is thrown on a police at a water fight during Songkran Festival celebrations Kowloon City district, known as Little Thailand as there is large number of restaurants and shops run by Thais, April 12, 2015. (Photo by Tyrone Siu/Reuters)

Revelers hold water guns as they participate in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 12, 2015. (Photo by Athit Perawongmetha/Reuters)

Revelers carry water guns as they participate in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 12, 2015. (Photo by Athit Perawongmetha/Reuters)

A child uses a water gun as he participates in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 12, 2015. (Photo by Athit Perawongmetha/Reuters)