BANGKOK, April 18 -- A total of 322 people were killed and 3,225 others injured in road accidents during the one-week Songkran holiday, or the Thai New Year, the Disaster Prevention and Mitigation Department said Friday.

From April 11 to 17, also known as the "seven dangerous days," 2,992 road accidents happened across Thailand, up 5.8 percent from the same period last year, according to the department.

The death toll declined by 0.31 percent year on year, while the number of injuries rose by 6.09 percent.

Drunk driving turned out to be the biggest cause of accidents, followed by speeding, the department said.

There were five provinces that recorded zero deaths from road accidents, including Chai Nat, Phetchaburi, Ang Thong, Phangnga and Yala, it added.