A 36-year-old woman who was visiting Washington Square Park with her five- and six-year-old children is in critical condition after being struck by a falling pine branch around 3pm on Friday afternoon. 

According to the Chronicle, the woman sustained a serious head injury from the falling branch, which weighed about 100 pounds and fell from 50 feet above. She was taken to SF General, where she remains in critical condition as of this morning. 

Mayor Ed Lee, expressing sympathy for the woman and her family, said that crews would be sent to the park to inspect its trees. A Rec and Park spokesperson told the Chron that a complete tree inspection was completed in Washington Square Park in 2008 and 2010, and that the Canary Island pine tree that dropped the branch had been identified as being in good condition. The trees were last pruned two years ago, and the spokesperson said that Canary Island pines had not previously caused any similar issues in city parks. 

For a deeper dive on the maintenance of the city's trees, check out our feature on the subject from last summer.