A Mid Hudson Valley town was supposed to get a large shipment of illegal bath salts, but customs officers got them first.

The Buffalo News reports that U.S. Customs and Border Protection Officers found 400 pills containing the drugs found in bath salts during a search on the Peace Bridge on Thursday. A package with a label saying it contained vitamins and costume masks was pulled aside for further inspection by agents.

After analyzing the contents of the shipment, authorities found 400 pills that were tested and revealed to contain Alpha PVP and N-ethylpentylone, drugs commonly known as bath salts.

The package, which originated from Mississauga, Ontario, was addressed to a location in Middletown, New York. It's not clear if the addressee was a person or a local business. The contents were seized by U.S. Customs and Border Protection Officers.

Bath salts can cause hallucinations, seizures, paranoia and other dangerous side effects. They are classified as a Schedule I drug.