Flowers are attached to the wall of a building in Seoul's Itaewon district, Oct. 30. Yonhap

An Australian national who survived a deadly stampede in Seoul's Itaewon district the previous day desperately searched for the body of his Australian friend on Sunday.

The 23-year-old female victim, whose identity was withheld, is believed to be one of 19 foreign nationals who died in a crush in a narrow downhill alley in the famous nightlife district on Saturday night after tens of thousands of people visited the area for Halloween.

At least 151 people were killed and 82 others were injured, according to local authorities. The foreigners killed also include those from Iran, Uzbekistan, China and Norway.

"I don't know where she is ... Next week's her birthday," Nathan Taverniti told Yonhap News Agency in front of Soonchunhyang University Hospital, where the bodies of some of the victims are located.