I get it now! An African swallow, who was illegally imported since they're non-migratory, landed on the bridge with a string tied around his leg which was attached to a coconut (he was also grabbing it by the husk). Anyway, he managed to break the string and then dropped the coconut on the bridge in order to crack it in two halves. Unfortunately, someone had switched and disguised a holy hand grenade with the coconut. Upon contact with the bridge, it exploded and caused the bridge to collapse on the man who was underneath it retrofitting the thing because it was in such bad shape. = )