At least 10 school children have died and 16 are still missing, rescuers said.
The bus had been carrying 37 pupils and seven members of staff to the Zara Maeen hot springs area when it was washed away, officials said.
IDF and civil search and rescue teams have flown to Jordan after flash flooding claimed the lives of 17 people, mostly schoolchildren.
Thirty-four people were saved in a major operation involving police helicopters and hundreds of army troops, police chief Brig.
The press officer said there was no information, yet, on the age of those killed in the flashflood and highlighted that those rescued suffered mild to serious injuries.
Relatives of those affected have been gathering outside a local hospital, waiting for news.
The region was bracing on Thursday for the first winter storms after the summer, with heavy rainfall and high winds expected.
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The Jordanian Prime Minister Omar al-Razaz is following on the situation and discussed in a telephone call the rescue operation with the Director General of the Jordanian Civil Defense.
Helicopters and divers were used during the rescue operation which lasted into Thursday night. They were caught in a narrow stream as sudden torrential rainstorm flooded the area.
The PSD said on Thursday that 15 people were injured in a pile up accidents on the Desert Highway, while the CDD press office reported that one man died in Maan in a separate traffic accident.
"Currently assisting Jordan in rescuing a bus full of children swept away in a flood on the Jordanian side of the Dead Sea", it wrote on Twitter.
As the death toll continued to rise, Jordan's King Abdullah II announced that he cancelled a visit to Bahrain, which had been scheduled for Friday.
Rescue workers were continuing to search for survivors, he said.
The low-lying Dead Sea area, part of the Jordan Valley, is prone to flash flooding when rain water rushes down from adjacent hills.