UPDATE 2-Wild celebrations in Boston after World Series win

(Adds details on fans, plans for parade)

By Jason Szep

BOSTON, Oct 29 (Reuters) - Hundreds of Red Sox fans jammed Boston's streets on Monday to celebrate their team's second World Series victory in four years, some hurling rocks at police in riot gear, smashing windows and lighting fires.

Police moved in on a crowd of up to 2,000 around Boston's historic Fenway Park, where at least one sport utility vehicle was overturned just after midnight after the Red Sox beat the Colorado Rockies 4-3 on Sunday in Denver in a four-game sweep.

Some fans climbed trees or streetlamps, shouting at police as celebrations briefly turned violent. A Boston police spokeswoman said 37 arrests were made. At least one person was treated for a head wound, local WBZ TV said.

Rioting fans smashed automobile windshields, trampled on cars, hurled bottles at police and lit small fires but these were extinguished by emergency authorities, local TV showed.

The crowds were smaller and more orderly than in 2004, when Boston ended an 86-year championship drought and exorcised what generations of fans had called a "curse."

Boston police wanted to avoid a repeat of a Fenway riot on Oct. 21, 2004, when police fired pepper pellets into crowds, killing a student, after Boston rallied from behind to beat the Yankees in New York to advance into the World Series.

Sunday's win over Colorado was hailed as a new era for the Red Sox, which had been dismissed as baseball's perennial also-rans before their 2004 World Series victory.