Many of Tokyo’s popular and iconic Somei Yoshino cherry blossom trees were planted during Japan’s postwar advancement in the 1960s, and are now getting old and frail. Some have fallen and others require support, triggering safety concerns.

Two cherry blossom trees collapsed on Thursday, one at Kinuta Park in downtown Tokyo and the other at the Chidorigafuchi greenway. The one in Kinuta Park damaged a fence while the other tree almost fell into the Imperial Palace moat, though nobody was injured. Last year, 85 trees fell in Tokyo parks, injuring three people, and many were cherry trees, according to Masakazu Noguchi, a Tokyo metropolitan official in charge of public parks.