Cowards, that is what the billboard in Boston near the I-93 expressway says! The sign belongs to the local chapter of the International Brotherhood of Electrical Workers (IBEW) union.

“It was Local 103?s way of shouting out our feelings of anger: Cowards,” business manager Michael P. Monahan told ABCNews.com.

Every 10 seconds the “Cowards” sign is replaced with and another that reads, “Pray for Boston.”

Courtesy IBEW Local 103

Courtesy IBEW Local 103