A day after businesses nationwide faced bomb threats sent over email, the former police commissioner in Yonkers says this will only continue.

Seven Hudson Valley locations were among many throughout the country who received bomb threats that demanded bitcoin Thursday. The threats were deemed not credible.

Then on Friday, six years after 26 people were killed at Sandy Hook Elementary School, a bomb threat was called into the school. Students ended up being sent home as a precaution. It is unclear if that threat was connected to the ones sent out the day before.

Security expert and former Yonkers Police Commissioner Edmund Hartnett says the threats still did some damage. They prompted some businesses to close, while police shut down streets as searches were conducted.

"Commerce was definitely affected by this, and I am sure the price tag on this was probably in the millions," says Hartnett.

Hartnett says the motive in Thursday's threats was a mixture of profit and disruption.

No suspects have been arrested in relation to the threats. Hartnett says finding them is like "a needle in an electronic haystack."

Hartnett thinks, though, because law enforcement will continue to have to investigate cases like these, they will improve at finding who is responsible.