Families of the bus passengers gathered at the church Saturday evening to comfort each other and pray.
Mayor Greg Ballard described many as "remarkably positive" despite their sorrow, but said there will be difficult days ahead.
"Some of the teenagers are hurting pretty bad and you can see that in their faces," he said.
Leffew thanked rescue workers and good Samaritans who tried to help after the crash, as well as local churches and businesses that have offered their support.
"We are so grateful for that outpouring of love and care," he said Sunday.