BIRMINGHAM, Ala. (AP) — Birmingham Airport Authority officials say concerns about flight information displays arose before one of the massive signs toppled onto a family and killed a 10-year-old boy.

Al Denson, CEO of the Airport Authority, says he learned Tuesday that some contractors and construction workers had serious concerns about the 300-pound monitors before one fell over and killed Luke Bresette, of Overland Park, Kan. His mother and siblings were also crushed and hospitalized.

WBRC-TV reports (http://bit.ly/12n8bWX ) the Airport Authority met in a closed session Thursday and afterward, Denson said two more displays had been removed from the airport until a structural engineer could review associated safety measures.

Officials have not elaborated on why they didn't respond to the concerns before the fatal accident, and say the incident is under investigation.