Police in Fort Worth and nearby Dallas didn't immediately return messages from the AP seeking information about the Texas arrest, and a local FBI spokeswoman said the arrest wasn't an FBI matter. Shell isn't listed in online records for the jails serving either city.
FBI special agent Richard Quinn said it was too early to speculate about what sort of charges could be filed against the caller but they could be severe.
McNeal, who was sitting next to Shell, said he hopes whoever made the call "pays for it."
"Because in this day and age," he said, "it's not funny."
If convicted, Smith faces a maximum sentence of 10 years in prison, a fine of up to $250,000, and possible restitution.