Heat A Concern For Boston Pops Fourth Of July Concert

The Boston Pops will hold a dress rehearsal Tuesday night for Wednesday's big Fourth of July concert.

Gates at the Hatch Shell open at 5 p.m. with the concert starting at 8 p.m.

Authorities are concerned the heat will take a toll on people heading to the Esplanade to celebrate the holiday.

"The biggest threat I see is the weather," Boston Police Commissioner Bill Evans said. "People have to bring plenty of water, and get some shade."

Evans reminded visitors that police will not allow certain items into the area around the Hatch Shell. Officials said people should bring liquids in a sealed, clear plastic container.

"Don't bring the coolers, don't bring the backpacks, don't bring anything like baby strollers that might slow down the line getting in here," he said.

There will be a heavy security presence around the event Wednesday, though authorities say there has been no credible threat made against it.

Boston Mayor Marty Walsh says visitors should work with police.

"The Fourth of July is a family event," he said. "Be smart. If you see something, say something. There will be increased police presence here and throughout the city of Boston."