The FBI, state and local law enforcement say the email bomb threats being sent to businesses and schools are a hoax.
Most telling, they say is the fact that the sender is demanding $20,000 to avoid exploding the supposed bombs. So far they say every threat that's been checked out has not proved credible.
Des Moines' Science Center of Iowa downtown was one of the businesses. Officials say they quickly evacuated the building while the Des Moines bomb squad swept the building.
The Polk County Emergency Management released a report that was sent to local officials in the county. It says:
In consultation with the FBI, the Iowa Division of Intelligence and Fusion Center (DOI/FC) recommends that any business which receives one of these threats report the information to the FBI's Public Access Line at tips.fbi.gov. The report to the FBI needs to include the full email threat including the expanded header information that will disclose the IP address from the sender. The submission should also include the name of the business and the type of products/services the business provides.