Boston Police Commissioner William Evans says authorities will step up security for concerts and sporting events in the city following the shooting in Las Vegas.
Officials have said there is no credible threat to Boston.
But Evans said the FBI told him Wednesday that agents turned up evidence that Las Vegas shooter Stephen Paddock researched sites in and around Fenway Park and the Boston Center for the Arts.
The Red Sox have said they're working with officials to beef up security.
Evans said security would be boosted for events including a Bruno Mars concert, a City Hall Plaza concert, road races and Red Sox games.
He says police also plan to meet with hotel officials in coming days to discuss ways for them to increase security.