Kansas City, Mo. ? The U.S. Postal Inspection Service is offering up to $100,000 as a reward for information about two explosive devices mailed to companies in Chicago and Kansas City.

“We are just seeking to utilize all the resources we have, including the American public,” Rich Sheehan, national spokesman for U.S Postal Inspection Service, said Wednesday.

One package arrived Jan. 31 at American Century Investments’ midtown Kansas City mail facility. A day later, a similar explosive was found at a business in a 65-story skyscraper in Chicago.

In a news release Tuesday, the Postal Inspection Service said the suspect may be linked to other letters received by financial institutions over the past 18 months.