Lucknow, Feb 15 (PTI) Four children were injured in a blast in a garbage dump near a marriage hall in Bulandshahr district today, police said. Fire crackers used during a wedding ceremony yesterday were thrown into the garbage bin, they said. When the children set fire to the heap, some of these, which remained unexploded, went off injuring them. The children, aged between eight and 10, were rushed to a nearby hospital which referred them to Delhi for treatment, police said.