BOSTON (WHDH) - Four twisted bronze spires were hoisted onto Boylston Street in Boston Wednesday morning, marking the spot where the city changed in a split second more than six years ago.

Crews have begun the first installation of the Boston Marathon bombing memorial, which honors the deaths of Martin Richard, Lingzi Lu, and Krystle Campbell, who were killed on April 15, 2013, along with Massachusetts Institute of Technology police officer Sean Collier and Boston Police Sgt. Dennis Simmonds, who died in the aftermath of the bombings.

The memorial is being set up at the sites of the first and second bombings, which were about 200 yards apart from each other.

Collier and Simmonds’ badges will be included in the pavers surrounding the inscription of the memorial.

Planning began four years ago for the $2 million memorial, which has undergone a substantial redesign to satisfy the hopes and expectations of families who lost loved ones.

Boston Chief of Operations Patrick Brophy called the first installation “a big moment for Boston and for everyone who was injured, hurt, and lost loved ones here.”

“I think it’s forever changed the landscape of Boylston Street,” he continued.

The designer of the memorial, artist Pablo Eduardo, worked closely with the impacted families to come up with a design full of symbolism.

“Spiraling metal things that protect a glass center and the glass center you can say represents life,” he said. “Glass is so fragile. We try to protect our own lives because they are so fragile.”

The intricate work to place the glass inside the twisted bronze spires is expected to take days.

The finished memorial will change the curb line of Boylston Street where the bombs went off, reflecting the fact that the area will never be the same again.

“You see it during the marathon, people come by and stop and bless themselves and have a moment of silence,” Brophy said,” every marathon before these were installed and it will happen after, I think forever.”

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