Many jubilant Red Sox fans spilled out into the streets early Monday after watching their team wrap up its fourth World Series title in 15 years with a 5-1 win over the Dodgers in Los Angeles.
No major problems were reported. Police closed off several streets around Fenway Park.
A World Series championship banner was unfurled outside the park just before dawn.
City officials are expected to announce plans Monday for a parade later in the week to honor the Red Sox.
It will be the 11th time since 2002 the city has enjoyed such a celebration for a sports championship.