JERUSALEM — Grief at the death of 21 people, mostly schoolchildren, in a flash flood near the Dead Sea in Jordan turned to anger on Friday as the Jordanian government said that the school that organized the trip may not have had the proper permits.

The middle-school students, from a private school in Amman, the capital, were visiting hot springs on Thursday when rain storms unleashed floods that swept them into a valley.

The Jordanian Civil Defense Directorate said in a statement on Friday that paramedics had treated 35 people who had been injured in the flood and that rescuers were continuing to search for a number of missing people.