According to the U.K.'s Daily Mail, striking teachers are responsible for the branch that fell on a teenager who was relaxing in a park that day instead of being in class. The headline was even on its homepage earlier today.
Update: Charlie Brooker points out that a tweet attributed by the story to an "angry parent"—"she should have been safe at school"—is not to be found by Twitter's search engine. Update: Found! It's someone who says they're a police officer and a parent of one of the victim's friends: "If the frigging teachers weren't on strike she would have been safe in school."