Retaining wall on steep hill behind Oak Square apartment building collapses, causing mudslide that partially buries some cars in mud

Some 20 to 30 feet of a retaining wall behind 121 Tremont St. in Oak Square in Brighton gave way around 8:45 p.m. after a tree fell on it, leading to a mudslide that partially buried two or three cars in the building's parking lot. Nobody inside the cars, at least.