Two buses transporting about 70 children to see "Les Miserables" at the Des Moines Civic Center crashed Saturday afternoon. No major injuries were immediately reported.Lt. Barry Schmidt, with the Ankeny Fire Department, told KCCI that the accident happened just after 3:30 p.m. on Interstate 35 South in Ankeny. Four people in a pickup truck were also involved in the crash.Some minor injuries, such as stiff neck, were reported but no one was taken to the hospital. Two buses with the Des Moines Area Regional Transit Authority brought the students to the Ankeny Fire Station.It is unclear what caused the crash, but officials said one bus, from the Algona Community School District, hit a pickup truck that was pulling a boat. The other bus, from the same school district, then rear-ended the first bus, authorities said.The accident caused a delay in traffic in the southbound lanes of Interstate 35.Check back with KCCI-TV, kcci.com or our mobile app for developments to this story.