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The Tall Ships return to Boston this weekend.
Huge crowds are expected for the Grand Parade of Sail on Saturday, when more than 50 ships enter and then circle Boston Harbor.
There will be tight security, a strong police presence, undercover officers and bag searches.
Massachusetts Undersecretary for Homeland Security Patrick McMurray joined WBUR for more on the security effort.
This segment aired on June 15, 2017.