Dave Grohl broke his leg after the second song during their concert in Sweden on June 12th. A very enthusiastic Grohl fell off the stage and allegedly said "I think I just broke my leg", after which Grohl was carried off stage. He then came back and performed the rest of the show sitting down.
mods, the sources are in swedish BUT they are from Swedens biggest newspaper = legit. also the photos kinda prove it's true so I hope this is ok!