(CNN) —— Emergency teams are working to find survivors and retrieve bodies after a massive flood hit Libya’s northeast three days ago, killing more than 6,000 and leaving 10,000 missing.

Satellite images showed buildings in the coastal city of Derna, the worst hit by the flood, destroyed by water and sand. The city’s shores appeared to have been severely eroded.

More than 6,000 people have died as of Wednesday morning local time, according to Saadeddin Abdul Wakil, health ministry undersecretary of the Unity Government in Tripoli, one of two rival governments operating in the country.

Local rescue teams continue to search for the missing, according to state media. More than 30,000 people have been displaced, the United Nations’ International Organization for Migration (IOM) in Libya said on Wednesday.