Los Angeles-based running group Los Angeles Speed Project is planning an impromptu marathon, dubbed Run for Boston, in honor and memory of Monday’s fatal attack at the finish line of the Boston Marathon.

The runners will come together as a community at 6 a.m. at the Santa Monica Pier, organizers said in an e-mail to the Daily Press. Almost 100 people had signed up for the run as of Tuesday afternoon.

To participate, visit the group’s Facebook page at facebook.com/events/360152760756747 for more information or call Blue Benadum at (310) 494-1857 or Tom Van Daele at (310) 802-2170.

“From marathoners to casual joggers, runners of all ages and skill levels will come together, not as individual athletes, but as a community showing their support for the victims of Monday’s events,” organizers said in the e-mail.

Officials in Boston said Tuesday morning that three people had died and 176 were injured when two bombs exploded 13 seconds apart near the finish line of the marathon. Of the wounded, 17 were listed in critical condition.

Bomb experts are analyzing materials used in the bombs to see if there is a signature, a style of explosive that would point to known terrorist organizations, according to the L.A. Times.

At Tufts Medical Center, doctors and nurses were cataloging all of the metal fragments removed from patients and turning them over to police and federal agents.

As of Tuesday no suspects were in custody.