A Belgian TV station is reporting that at least one of the bombs at the Brussels airport contained nails.

Flemish language broadcaster VTM interviewed Marc Decramer of the Gasthuisberg hospital in Leuven, who says the hospital is treating 11 people with serious injuries, three of them in critical condition. Decramer says the wounded have fractures and deep cuts caused by flying glass and nails.

Belgian officials say 34 people were killed Tuesday and 187 wounded in two explosions at the Belgium airport and one at a city subway station.