"In the hospital thanks to @khloekardashian," Jenner, 16, said in a message posted Tuesday. "My mom said, 'Never thought I would take u to the doctor for a trampoline accident at this age.' This means war Khloe."
"This started out calm and ended in a war! Sorry @kyliejenner," Khloe Kardashian, 29, wrote back.
Instagram photos showed Khloe tackling Jenner, but they didn't suggest what Jenner's injuries are.
Interpol investigating stolen passports on missing flight
Dennis Rodman pledges to end trips to North Korea