The Boston Marathon bombing memorial is coming together on Boylston Street

Bronze spires were installed at one of the blast sites Wednesday morning.

Installation of marathon memorial to begin on Boylston Street by the site of the old Forum restaurant. Work includes installing the bronze spire that will surround the light pillars.
–David L Ryan/Globe Staff

Four bronze spires now rise to the sky at 755 Boylston St. in memory of the 2013 Boston Marathon bombing.

This is just the beginning of the installation process for the memorials that will mark the two places pressure-cooker bombs exploded on April 15, 2013, killing three people and injuring hundreds more.

The memorials, which will feature light pillars, metal, and stone, are expected to be completed by the end of the summer, according to The Boston Globe.

On the left is artist Pablo Eduardo. —David L Ryan/Globe Staff