A mirror at a retail store fell on a 3-year-old boy, killing him, officials said.

Christopher Antonio was apparently playing near the 5-foot-tall, floor-mounted mirror in the children's section of a Wal-Mart in Indianapolis when it fell Saturday.

The toddler was likely killed by the blunt force of the crash, said Marion County Sheriff's Lt. Michael DeHart.

"The mother was approximately five feet away from the child when she heard a loud crash," DeHart said. The boy's five-year-old sister was also at the store, deputies said.

His mother and another shopper pulled the mirror off the boy, DeHart said.

Wal-Mart was cooperating with investigators, said Jolanda Stewart, spokeswoman for Bentonville, Arkansas-based Wal-Mart Stores Inc.

"Our thoughts and prayers are with the family and the matter is under investigation," she said.